Capital Cities of the World: Mexico CIty part 2

From Wikipedia: Growth of the colonial city
The city grew as the population did, coming up against the lake's waters. The 16th century saw a proliferation of churches, many of which can still be seen today in the historic center. Economically, Mexico City prospered as a result of trade. Unlike Brazil or Peru, Mexico had easy contact with both the Atlantic and Pacific worlds. Although the Spanish crown tried to completely regulate all commerce in the city, it had only partial success.

The concept of nobility flourished in New Spain in a way not seen in other parts of the Americas. Spaniards encountered a society in which the concept of nobility mirrored that of their own. Spaniards respected the indigenous order of nobility and added to it. In the ensuing centuries, a noble title in Mexico did not mean one exercised great political power as one's power was limited even if the accumulation of wealth was not. The concept of nobility in Mexico was not political but rather a very conservative Spanish social one, based on proving the worthiness of the family.

Most of these families proved their worth by making fortunes in New Spain outside of the city itself, then spending the revenues in the capital, building churches, supporting charities and building extravagant palatial homes. The craze to build the most opulent home possible reached its height in the last half of the 18th century. Many of these homes can still be seen today, leading to Mexico City's nickname of "The city of palaces" given by Alexander Von Humboldt.

The Grito de Dolores ("Cry of Dolores") also known as El Grito de la Independencia ("Cry of Independence"), uttered from the small town of Dolores near Guanajuato on September 16, 1810, is the event that marks the beginning of the Mexican War of Independence and is the most important national holiday observed in Mexico. The "Grito" was the battle cry of the Mexican War of Independence by Miguel Hidalgo y Costilla, a Roman Catholic priest. Hidalgo and several criollos were involved in a planned revolt against the Spanish colonial government, and the plotters were betrayed. Fearing his arrest, Hidalgo commanded his brother Mauricio as well as Ignacio Allende and Mariano Abasolo to go with a number of other armed men to make the sheriff release the pro-independence inmates there on the night of September 15. They managed to set eighty free.

Around 6:00 am September 16, 1810, Hidalgo ordered the church bells to be rung and gathered his congregation. Flanked by Allende and Juan Aldama, he addressed the people in front of his church, encouraging them to revolt. The Battle of Guanajuato, the first major engagement of the insurgency, occurred four days later. Mexico's independence from Spain was effectively declared in the Declaration of Independence of the Mexican Empire on September 27, 1821, after a decade of war. Unrest followed for the next several decades, as different factions fought for control of Mexico.

The Mexican Federal District was established by the new government and by the signing of their new constitution, where the concept of a federal district was adapted from The U.S. constitution. Before this designation, Mexico City had served as the seat of government for both the State of Mexico and the nation as a whole. Texcoco and then Toluca became the capital of the state of Mexico.

The Battle of Mexico City
The Mexican–American War came to a close after the United States deployed combat units deep into Mexico resulting in the capture of Mexico City and Veracruz by the U.S. Army's 1st, 2nd, 3rd and 4th Divisions. The invasion culminated with the storming of Chapultepec Castle in the city itself. The treaty of Guadalupe Hidalgo was signed in what is now the far north of the city.

Events such as the Reform War left the city relatively untouched and it continued to grow, especially during the rule of President Porfirio Díaz. During this time, the city developed a modern infrastructure, such as roads, schools, transportation, and communication systems. However, the regime concentrated resources and wealth into the city while the rest languished in poverty.

Revolution
Fast modern development eventually led to the Mexican Revolution. The most significant episode of this period for the city was the La decena trágica ("The Ten Tragic Days"), a coup against President Francisco I. Madero and his vice president, José María Pino Suárez. Victoriano Huerta, chief general of the Federal Army saw a chance to take power, forcing Madero and Pino Suarez to sign resignations. The two were murdered later while on their way to prison.

20th century to present
The history of the rest of the 20th century to the present focuses on the phenomenal growth of the city and its environmental and political consequences. In 1900, the population of Mexico City was about 500,000. The city began to grow rapidly westward in the early part of the 20th century and then began to grow upwards in the 1950s, with the Torre Latinoamericana becoming the city's first skyscraper. The 1968 Olympic Games brought about the construction of large sporting facilities.

In 1969, the Metro system was inaugurated. Explosive growth in the population of the city started from the 1960s, with the population overflowing the boundaries of the Federal District into the neighboring state of Mexico, especially to the north, northwest and northeast. Between 1960 and 1980 the city's population more than doubled to 8,831,079.

In 1980, half of all the industrial jobs in Mexico were located in Mexico City. Under relentless growth, the Mexico City government could barely keep up with services. Villagers from the countryside who continued to pour into the city to escape poverty only compounded the city's problems. With no housing available, they took over lands surrounding the city, creating huge shantytowns that extended for many miles. This caused serious air pollution in Mexico City and water pollution problems, as well as a sinking city due to over-extraction of groundwater, groundwater-related subsidence. Air and water pollution has been contained and improved in several areas due to government programs, the renovation of vehicles and the modernization of public transportation.

The autocratic government that ruled Mexico City since the Revolution was tolerated, mostly because of the continued economic expansion since World War II. This was the case even though this government could not handle the population and pollution problems adequately. Nevertheless, discontent and protests began in the 1960s leading to the massacre of an unknown number of protesting students in Tlatelolco.

Three years later, a demonstration in the Maestros avenue, organized by former members of the 1968 student movement, was violently repressed by a paramilitary group called "Los Halcones", composed of gang members and teenagers from many sports clubs who received training in the U.S.

On Thursday, September 19, 1985, at 7:19 am local time, Mexico City was struck by an earthquake of magnitude 8.1 on the Richter scale. Although this earthquake was not as deadly or destructive as many similar events in Asia and other parts of Latin America, it proved to be a disaster politically for the one-party government. The government was paralyzed by its own bureaucracy and corruption, forcing ordinary citizens to create and direct their own rescue efforts and to reconstruct much of the housing that was lost as well.

However, the last straw may have been the controverted elections of 1988. That year, the presidency was set between the P.R.I.'s candidate, Carlos Salinas de Gortari, and a coalition of left-wing parties led by Cuauhtémoc Cárdenas, son of the former president Lázaro Cárdenas. The counting system "fell" because coincidentally the light went out and suddenly, when it returned, the winning candidate was Salinas, even though Cárdenas had the upper hand. As a result of the fraudulent election, Cárdenas became a member of the Party of the Democratic Revolution. Discontent over the election eventually led Cuauhtémoc Cárdenas to become the first elected mayor of Mexico City in 1997. Cárdenas promised a more democratic government, and his party claimed some victories against crime, pollution, and other major problems. He resigned in 1999 to run for the presidency.

Record Number of Teens Nat’l Geographic Bee Finalists

From IndiaWest: Record Number of Teens Nat’l Geographic Bee Finalists
A record number of Indian American tweens and teens will compete in the 2012 National Geographic Bee May 22-24 in Washington, D.C.

Fifty-four state geography bees were held throughout the U.S. Mar. 30, determining the contestants who will face off at the national championships next month. Seventeen Indian Americans will represent their states in the tough, nail-biting, annual competition, which is aimed at incentivizing teachers and schools to include more geography lessons in their curriculum. Students in 4th to 8th grade are eligible to compete.

Indian Americans have always featured prominently in the National Geographic Bee finals, hosted in the nation’s capitol by “Jeopardy’s” Alex Trebek. Last year, Nilai Sarda of Atlanta, Georgia took second place in the 2011 Bee. Karthik Karnik, of Norfolk, Mass., took 5th place. Karnik is competing again in this year’s competition.

In 2010, 13-year-old Aadith Moorthy of Palm Harbor, Fla., adeptly won the National Geographic Bee, taking home a $25,000 scholarship and a trip to the Galapagos Islands.

The 2012 National Geographic Bee Indian American state winners are:

• Raghav Ranga, 8th grade, St. Gregory College Preparatory School, Tucson, Ariz.
• Varun Mahadevan, 7th grade, Prince of Peace Lutheran School, Fremont, Calif.
• Pranit Nanda, 6th grade, Aurora Quest K-8 School, Aurora, Colo.
• Maya Patel, 8th grade, Liberty Middle School, Tampa, Fla.
• Sahr Singh, 7th grade, Dodgen Middle School, Marietta, Georgia
• Ganesh Aruna, 8th grade, Overland Trail Middle School, Overland Park, Kansas
• Nikhil Krishna, 6th grade, Corbin Intermediate School, Corbin, Kentucky
• Karthik Karnik, 8th grade, King Philip Regional Middle School, Norfolk, Mass.
• Gopi Ramanathan, 8th grade, Sartell Middle School, Sartell, Minn.
• Neelam Sandhu, 7th grade, Ross A. Lurgio Middle School, Bedford, New Hampshire
• Siddharth Kurella, 8th grade, Crossroads North Middle School, Monmouth Junction, New Jersey
• Aparna Nair-Kanneganti, 8th grade, Henry H. Wells Middle School, Brewster, New York
• Pragyna Naik, 6th grade, Franklin K-8 School of Choice, Corvallis, Ore.
• Arnav Jagasia, 8th grade, Radnor Middle School, Wayne, Penn.
• Krish Patel, 6th grade, Pinewood Preparatory School, Summerville, South Carolina
• Rahul Nagveker, 8th grade, Quail Valley Middle School, Missouri City, Texas
• Vansh Jain, 8th grade, MHLT Elementary School, Minocqua, Wisc.

The first National Geography Bee was held in 1989. Each year, thousands of students compete from November to January at the school level, then move on to state championships in March. The National Geographic Web site features a new geography quiz each day, plus a study guide and apps to help students prepare for the Bee and to encourage a general interest in the subject.

New Geographic Institute facilities unveiled

From Angola Press: New Geographic Institute facilities unveiled
Huambo - The Geographical and Cadastral Institute of Angola (IGCA) in central Huambo province counts from Friday on its own facilities, inaugurated by the vice-president, Fernando da Piedade Dias dos Santos.

The infrastructure, located nearby the administration of the city of Huambo, was built in eight months and cost USD 470,000.

The building, with several offices, will give greater comfort to the 23 employees of the provincial offices of the IGCA and better labour conditions for them.

The vice president walked through the infrastructure and was briefed on the working conditions that exist there.

New Malawi president purges Mutharika allies

Malawi, officially the Republic of Malawi, is a landlocked country in southeast Africa that was formerly known as Nyasaland. It is bordered by Zambia to the northwest, Tanzania to the northeast, and Mozambique on the east, south and west. The country is separated from Tanzania and Mozambique by Lake Malawi. Malawi is over 118,000 km2 (45,560 sq mi) with an estimated population of more than 13,900,000. Its capital is Lilongwe, which is also Malawi's largest city; the second largest is Blantyre and the third is Mzuzu. The name Malawi comes from the Maravi, an old name of the Nyanja people that inhabit the area. The country is also nicknamed, "The Warm Heart of Africa".

The area of Africa now known as Malawi was colonized by migrating tribes of Bantu around the 10th century. In 1891 the area was colonized again, this time by the British. In 1953 Malawi, then known as Nyasaland, became part of the semi-independent Central African Federation (CAF). The Federation was dissolved in 1963 and in 1964, Nyasaland gained full independence and was renamed Malawi.

Upon gaining independence it became a single-party state under the presidency of Hastings Banda, who remained president until 1994, when he was ousted from power. Joyce Banda (no relation) is the current president, raised to that position after president Bingu Mutharika died in 2012. Malawi has a democratic, multi-party government. Malawi has a small military force that includes an army, a navy and an air wing. Malawi's foreign policy is pro-Western and includes positive diplomatic relations with most countries and participation in several international organizations.

From Capital FM: New Malawi president purges Mutharika allies
LILONGWE, Apr 10 – Malawi’s new President Joyce Banda on Tuesday unveiled a shake-up of top officials charged with government finances and media, purging loyalists of the late leader Bingu wa Mutharika.

“Although we are in mourning, certain decisions cannot wait,” Banda told a news conference in the capital Lilongwe, three days after taking office.

She also announced an investigation into the mysterious murder of student activist Robert Chasowa. Mutharika’s critics have accused police of staging a hit against Chasowa, implicating former police chief Peter Mukhito, who was sacked on Monday.

“As a mother, I feel for my fellow mother who doesn’t know what killed her son. I understand how painful it is, and I will make sure we find out who killed our son Chasowa,” Banda said.

“We don’t want people to go about murdering people fearlessly.” Top among Banda’s new appointments was Mary Nkosi as Reserve Bank governor, making her the first woman to hold the job.

A long-time deputy governor, she replaces Perks Ligoya, a close ally of Mutharika who pursued a rigid exchange rate policy that the International Monetary Fund has blamed for much of Malawi’s economic woes.

She named a new secretary to the Treasury, appointing career bureaucrat Radson Mwadiwa, who also becomes chairman of the state-owned Malawi Savings Bank.

Banda sacked Patricia Kaliati, the information minister who publicly insisted that Mutharika was alive more than one day after his death on Thursday.

The new minister is Moses Kunkuyu, a parliamentarian who broke away from Mutharika’s Democratic Progressive Party to press for reforms.

She also sacked the head of the Malawi Broadcasting Corporation, Bright Malopa, another Mutharika ally who used state media to campaign against Banda after her expulsion from the DPP.

The new director general is Benson Tembo, a veteran broadcaster and former diplomat whose last posting was as ambassador to Zimbabwe.

Easter Pause

So sorry to have missed so many days of posting - unexpected family matters cropped up.

And now it's Easter, so more family matters.

Will get back on track Monday.

Thanks for your patience.

San Diego, CA: Mount Palomar Observatory

Palomar Observatory is a privately owned astronomical observatory located in San Diego County, California (USA), 145 kilometers (90 mi) southeast of Los Angeles, California, in the Palomar Mountain Range. It is owned and operated by the California Institute of Technology (Caltech) located in Pasadena, California. Research time is granted to Caltech and its research partners, which includes the Jet Propulsion Laboratory (JPL) and Cornell University.

The observatory operates several telescopes, including the famous 200-inch Hale Telescope (5.1 m) and the 48-inch Samuel Oschin Telescope (1.2 m). In addition, other instruments and projects have been hosted at the observatory, such as the Palomar Testbed Interferometer and the historic 18-inch Schmidt telescope (0.46 m), Palomar Observatory's first telescope, dating from 1936.

History
stronomer George Ellery Hale, whose vision created the Palomar Observatory, built the world's largest telescope four times. He published an article in the April 1928 issue of Harper's Magazine called "The Possibilities of Large Telescopes". This article contained Hale's vision for building what was to become the 200-inch Palomar reflector; it was an invitation to the American public to learn about how large telescopes could help answer questions relating to the fundamental nature of the universe. Hale hoped that the American people would understand and support his project. In fact the 200-inch telescope was the most important telescope in the world from 1949 until 1992 when the Keck I telescope (at approximately 10 metres (390 in)) on Mauna Kea in Hawaii became the world's largest.

Hale followed this article with a letter to the International Education Board (later absorbed into the General Education Board) of the Rockefeller Foundation dated April 28, 1928, in which he requested funding for this project. In his letter, Hale stated:

"No method of advancing science is so productive as the development of new and more powerful instruments and methods of research. A larger telescope would not only furnish the necessary gain in light space-penetration and photographic resolving power, but permit the application of ideas and devices derived chiefly from the recent fundamental advances in physics and chemistry."

Etymology
The word palomar is a Spanish term dating from the time of Spanish California that means pigeon house (in the same sense as henhouse). The name may be in reference to the large shoals of pigeons that can be seen during the spring and autumn months atop Palomar Mountain, or reminiscent of an old pigeon-raising facility built there by the Spaniards.

The Hale Telescope
The 200-inch telescope is named after astronomer George Hale. It was built by Caltech with a $6 million grant from the Rockefeller Foundation, using a Pyrex blank manufactured by Corning Glass Works. The telescope (the largest in the world at that time) saw first light January 26, 1949 targeting NGC 2261. The American astronomer Edwin Powell Hubble, perhaps the most important observer of the 20th century, was given the honor of being the first astronomer to use the telescope.

Astronomers using the Hale Telescope have discovered distant objects at the edges of the known universe called quasars and have given us the first direct evidence of stars in distant galaxies. They have studied the structure and chemistry of intergalactic clouds leading to an understanding of the synthesis of elements in the universe and have discovered thousands of asteroids. A one-tenth-scale engineering model of the telescope at Corning Community College in Corning, New York, home of the Corning Glass Works (now Corning Incorporated) was used to discover at least one minor planet, (34419) Corning †.

Architecture and design
According to the Observatory's Public Affairs Office, Russell W. Porter was primarily responsible for the striking Art Deco architecture of the Observatory's buildings, most notably the dome of the 200–inch Hale Telescope. Porter was also responsible for much of the technical design of the Hale Telescope and Schmidt Cameras, producing a series of remarkable cross-section engineering drawings that are considered among the finest examples of such work. Porter worked on the designs in collaboration with many engineers and Caltech committee members. The iconic, gleaming white building on Palomar Mountain that houses the 200–inch Hale Telescope is considered by many to be "The Cathedral of Astronomy".

Directors
* Ira Sprague Bowen, 1948–1964
* Horace Welcome Babcock, 1964–1978
* Maarten Schmidt, 1978–1980
* Gerry Neugebauer, 1980–1994
* James Westphal, 1994–1997
* Wallace Leslie William Sargent, 1997–2000
* Richard Ellis, 2000–2006
* Shrinivas Kulkarni, 2006–

Palomar Observatory and light pollution
Much of the surrounding region of Southern California has adopted shielded lighting to reduce the light pollution that would potentially affect the observatory.

Telescopes and instruments
* The 200-inch Hale Telescope was first proposed in 1928 and has been operational since 1948. It was the largest telescope in the world for 45 years. * A 60-inch reflecting telescope is located in the Oscar Mayer Building. It was dedicated in 1970 to take some of the load off of the Hale Telescope. This telescope was used to discovered the first brown dwarf star. * The 48-inch Samuel Oschin Telescope (Schmidt Camera) was started in 1938 and installed in 1948. It was initially called the 48–inch Schmidt, and was dedicated to Samuel Oschin in 1986. The dwarf planet Eris was discovered using this instrument. The existence of Eris triggered the discussions in the international astronomy community that led to Pluto being re-classified as a dwarf planet. * A 24-inch robotic telescope completed in January 2006 is used to monitor the weather on Saturn's largest moon, Titan. It is also used for follow-up observations of solar system discovered with the Oschin telescope.

Former instruments
* An 18-inch Schmidt camera became became the first operational telescope at the Palomar in 1936. In the 1930s a Caltech astronomer named Fritz Zwicky discovered over 100 supernovae (exploding stars) in other galaxies with this telescope and gathered the first evidence for dark matter. Comet Shoemaker-Levy 9 was discovered with this instrument in 1993. It has since been retired.

* The Palomar Testbed Interferometer was a multi-telescope instrument that permitted astronomers to make very high resolution measurements of the sizes and positions of objects in space. The shapes of some bright stars have been measured with the PTI. It operated from 1995 to 2008.

* The Palomar Planet Search Telescope (PPST), aka Sleuth, was a 0.1 m (3.9 in) robotic telescope that operated from 2003 until 2008. It was dedicated to the search for planets around other stars using the transit method. It operated in conjunction with telescopes at Lowell Observatory and in the Canary Islands as part of the Trans-atlantic Exoplanet Survey (TrES). Research
The observatory has completed several astronomical surveys: the first in the 1950s, the second in the 1980s and 1990s, and a third in 2003. POSS-I
The initial Palomar Observatory Sky Survey (POSS or POSS-I), sponsored by the National Geographic institute, was completed in 1958. The first plates were shot in November 1948 and the last in April 1958. This survey was performed using 14 inch2 or (6 degree2) blue-sensitive (Kodak 103a-O) and red-sensitive (Kodak 103a-E) photographic plates on the 48-inch Samuel Oschin Schmidt reflecting telescope. The survey covered the sky from a declination of +90 degrees (celestial north pole) to -27 degrees and all right ascensions and had a sensitivity to +22 magnitudes (about 1 million times fainter than the limit of human vision). A southern extension extending the sky coverage of the POSS to -33 degrees declination was shot in 1957 - 1958. The final POSS I consisted of 937 plate pairs. Fritz Zwicky was the first astronomer to observe on Mt. Palomar and was the father of the Sky Survey Technique. Digitized Sky Survey (DSS) produced images which were based on the photographic data developed in the course of POSS-I. J.B. Whiteoak, an Australian radio astronomer, used the same instrument to broaden this POSS-I data further. Whiteoaks observations extended south to about -45 degrees declination, using the same field centers as the corresponding northern declination zones. Unlike POSS-I, the Whiteoak extension consisted only of red-sensitive (Kodak 103a-E) photographic plates. POSS-II The Second Palomar Observatory Sky Survey (POSS-II) was performed in the 1980s and 1990s that made use of better, faster films and an upgraded telescope. The Oschin Schmidt was given an achromatic corrector and provisions for autoguiding. Images were recorded in three wavelengths: blue (IIIaJ), red (IIIaF) and near infrared (IVN) plates, respectively. Observers on POSS II included C. Brewer, D. Griffiths, W. McKinley, D. Mendenhall, K. Rykoski, J. Phinney and Jean Mueller (who discovered over 100 supernovae by comparing the POSS I and POSS II plates). Ms Mueller also discovered several comets during the course of POSS II and the bright Comet Wilson 1986 was discovered by then graduate student C. Wilson early in the survey. Until the completion of the Two Micron All Sky Survey (2MASS), POSS-II was the most extensive wide-field sky survey ever. When completed, the Sloan Digital Sky Survey will surpass POSS-I and POSS-II in depth, although the POSS covers almost 2.5 times more area on the sky. POSS-II also exists in digitized form (i.e., the photographic plates were scanned), both in photographic form as the Digitized Sky Survey (DSS). QUEST
The multi-year POSS projects were followed by the Palomar Quasar Equatorial Survey Team (QUEST) Variability survey. This survey yielded results that were used by several projects, including the Near-Earth Asteroid Tracking project. Another program that used the QUEST results discovered 90377 Sedna on 14 November 2003, and around 40 Kuiper belt objects. Other programs that share the camera are Shri Kulkarni's search for gamma-ray bursts (this takes advantage of the automated telescope's ability to react as soon as a burst is seen and take a series of snapshots of the fading burst), Richard Ellis' search for supernovae to test whether the universe's expansion is accelerating or not, and S. George Djorgovski's quasar search.

The camera for the Palomar QUEST Survey was a mosaic of 112 Charge-coupled devices (CCDs) covering the whole (4 degree by 4 degree) field of view of the Schmidt telescope, the largest CCD mosaic used in an astronomical camera when built. This instrument was used to produce The Big Picture, the largest astronomical photograph ever produced.

The Big Picture is on display at Griffith Observatory.

Current research
Current research programs on the 200-inch Hale Telescope cover the range of the observable universe including studies on near-Earth asteroids, outer solar system planets, Kuiper Belt Objects, star formation, exoplanets, gamma-ray bursts, black holes, quasars and much more.

The 48-inch Samuel Oschin Schmidt Telescope is actively working on a new sky survey, the Palomar Transient Factory (PTF). The 60-inch telescope is used for a variety of projects including follow-up observations for the Palomar Transient Factory and is a rapid response telescope for gamma-ray bursts.

Clearest images
In September 2007, a team of astronomers from the United States and Britain released some of the clearest pictures ever taken of outer space. The pictures were obtained through the use of a new hybrid "Lucky imaging" and "adaptive optics" system that sharpens pictures taken from the Palomar Observatory. The resolution attained exceeds that of the Hubble Space Telescope by a factor of two.

Visiting
The Palomar Observatory is an active research facility. However, parts of it are open to the public during the day. Visitors can take self-guided tours of the 200-inch telescope daily from 9 a.m. to 3 p.m. Guided tours of the 200-inch Hale Telescope dome and observing area are available Saturdays and Sundays from April through October. Details are available at the Observatory's web site. There is a visitor's center and a gift shop on the grounds. Behind-the-scenes tours for the public are offered through the community support group, Friends of Palomar support group. Periodic tours are also organized by the Reuben H. Fleet Science Center in San Diego. The observatory is located off State Route 76 in northern San Diego County, California, is two hours' drive from downtown San Diego, and three hours' drive from central Los Angeles ( UCLA, LAX airport ).

In pop culture
The band Wellwater Conspiracy's 1997 debut album, Declaration of Conformity, contains a track entitled "Palomar Observatory." It is the last track on the album and completely instrumental. It is likely the track title was chosen by singer/drummer Matt Cameron, who grew up in San Diego near the observatory. Also, Canadian band The Rheostatics 11th track from their effort Whale Music is entitled Palomar. The song depicts a man named Palomar on the top of a mount, cleaning his lenses with saline waters. Palomar assembles his kaleidoscope in his lonely observatory. The song presents a visual characterization of a man on a mountain and his relationship with his best friend, a dog.

Palomar is mentioned in the first episode of season 2 of The X-Files, "Little Green Men". Fox Mulder refers to Hale's suggestion that an elf crawled through his window and told him to build the observatory.

Los Angeles, California: Mount Wilson Observatory (Observatories around the World)

The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,715 foot (1,742 m) peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles. The observatory contains two historically important telescopes: the 60 inch (1.5 m) Hale telescope built in 1908, and the 100 inch (2.5 m) Hooker telescope, which was the largest telescope in the world from its completion in 1917 until 1948.

Thanks to the inversion layer that traps smog over Los Angeles, Mount Wilson has naturally steadier air than any other location in North America, making it ideal for astronomy and in particular for interferometry. The increasing light pollution due to the growth of greater Los Angeles has limited the ability of the observatory to engage in deep space astronomy, but it remains a productive center, with many new and old instruments in use for astronomical research.

The observatory was conceived and founded by George Ellery Hale, who had built the 40 inch (1 m) telescope at the Yerkes Observatory. The Mount Wilson Solar Observatory was first funded by the Carnegie Institution of Washington in 1904, leasing the land from the owners of the Mount Wilson Hotel in 1904. Among the conditions of the lease was that it allow public access.

George Ellery Hale received the 60 inch (1.5 m) mirror blank, cast by Saint-Gobain in France, in 1896 as a gift from his father, William Hale. It was a glass disk 7½ inches (191 mm) thick and weighing 1900 pounds (860 kg). However it was not until 1904 that Hale received funding from the Carnegie Institution to build an observatory. Grinding began in 1905 and took two years. The mounting and structure for the telescope was built in San Francisco and barely survived the 1906 earthquake. Transporting the pieces to the top of Mount Wilson was an enormous task. "First light" was December 8, 1908. It was at the time the largest operational telescope in the world.

The 60 inch reflector became one of the most productive and successful telescopes in astronomical history. Its design and light-gathering power allowed the pioneering of spectroscopic analysis, parallax measurements, nebula photography, and photometric photography. Though surpassed in size by the Hooker telescope nine years later, the Hale telescope remained one of the largest in use for decades.

In 1992, the 60 inch telescope was fitted with an early adaptive optics system, the Atmospheric Compensation Experiment (ACE). The 69-channel system improved the potential resolving power of the telescope from 0.5-1.0 arc sec to 0.07 arc sec. ACE was developed by DARPA for the Strategic Defense Initiative system, and the National Science Foundation funded the civilian conversion.

Today, the 60 inch telescope is used for public outreach. Eyepieces are fitted to its focus instead of instruments. It is the largest telescope in the world devoted to the general public. As of June 2009, the cost for a half-night of observation is $900, $1700 for a full night.

100 inch (2.5 m) Hooker Telescope
Hale immediately set about creating a larger telescope. John D. Hooker provided crucial funding for it, along with Carnegie.[3] The Saint-Gobain factory was again chosen to cast a blank in 1906, which it completed in 1908, After considerable trouble over the blank (and potential replacements), the 100 inch (2.5 m) telescope was completed and saw "first light" on November 2, 1917. The blank started with over two tons of fused glass which was melted in a furnace into one piece. The blank once melted into one piece took over a year to cool without cracking.

Just like the 60" telescope, the mechanism incorporates a mercury float to provide smooth operation. The Hooker telescope was equipped in 1919 with a special attachment, an optical astronomical interferometer developed by Albert Michelson, much larger than the one he had used to measure Jupiter's satellites. Michelson was able to use the equipment to determine the precise diameter of stars, such as Betelgeuse, the first time the size of a star had ever been measured. Henry Norris Russell developed his star classification system based on observations using the Hooker.

In 1935 the silver coating used since 1917 on the Hooker 100 inch mirror was replaced with a more modern and longer lasting aluminum metallic coating that reflected 50% more light than the older silver method of coating. The newer method of coating for the telescope mirrors was first tested on the older 60 inch mirror telescope.

Edwin Hubble performed his critical calculations from work on the 100 inch (2.5 m) telescope. He determined that some nebulae were actually galaxies outside our own Milky Way. Hubble, assisted by Milton L. Humason, discovered the presence of the redshift that indicated the universe is expanding.

The Hooker's reign of three decades as the largest telescope came to an end when the Caltech-Carnegie consortium completed its 200-inch (5.1 m) telescope in 1948 at Palomar Observatory, 90 miles (150 km) south, in San Diego County, California.

By the 1980s, the focus of astronomy research had turned to deep space observation, which required darker skies than what could be found in the Los Angeles area, due to ever-increasing problem of light pollution. In 1986, the Carnegie Institution, which ran the observatory, handed it over to the non-profit Mount Wilson Institute. At that time, the 100 inch (2.5 m) telescope was deactivated, but it was restarted in 1992 and outfitted with adaptive optics. The Hooker telescope remains one of the pre-eminent scientific instruments of the 20th century.

The telescope has a resolving power of 0.05 arcsecond.

Solar telescopes There are three solar telescopes, two of which are now used for astronomical research, also known as solar towers due to their construction. The 60 foot (18 m) tower telescope was completed in 1908, and the 150 foot (46 m) tower telescope was completed in 1912. The Snow solar telescope, built in 1904 is used for educational demonstrations. The telescopes are used to study helioseismology and other changes in the sun's nature.

Interferometry
The extremely steady air over Mount Wilson is well suited to interferometry, the use of multiple viewing points to increase resolution enough to allow for the direct measurement of the size of details such as star diameters. Michelson performed the first measurements of other stars in the history of astronomical interferometry on the Hooker telescope in 1919.

The Infrared Spatial Interferometer (ISI) is an array of three 65 inch (1.65 m) telescopes operating in the mid-infrared. The telescopes are fully mobile and their current site on Mount Wilson allows for placements as far as 70 m apart, giving the resolution of a telescope of that diameter. The signals are converted to radio frequencies through heterodyne circuits and then combined electronically using techniques copied from radio astronomy. ISI is run by an arm of the University of California, Berkeley. The longest (70m) baseline provides a resolution of 0.003 arcsec at 11 micrometers. On July 9, 2003, ISI recorded the first closure phase aperture synthesis measurements in the mid infrared.

The Center for High Angular Resolution Astronomy (CHARA) array is an interferometer formed from six 1 m (40-inch) telescopes arranged along three axes with a maximum separation length of 330 m. The light beams travel through vacuum tubes and are combined optically, requiring a building 100 meters long with movable mirrors to keep the light in phase as the earth rotates. CHARA is operated by the Georgia State University and began scientific use in 2002 and began "routine operations" in early 2004. In infrared the integrated image can resolve down to 0.0005 arcseconds. As of 2005, four of the six telescopes have been commissioned for interferometric observations.

These and other astronomical interferometers are included in the List of astronomical interferometers at visible and infrared wavelengths. The history of the development of these instruments is given in History of astronomical interferometry.

Other telescopes
A 24-inch (610 mm) telescope fitted with an infrared detector purchased from a military contractor was used by Eric Becklin in 1966 to determine the center of the Milky Way for the first time. In 1968, the first large-area near-IR (2.2 µm) survey of the sky was conducted by Gerry Neugebauer and Robert B. Leighton using a 62-inch (1.6 m) reflecting dish they had built.[7] The instrument is now in the Smithsonian.

History
* Letters to the Mount Wilson Observatory are the subject of a permanent exhibition at the Museum of Jurassic Technology in Los Angeles, California. A small room is dedicated to a collection of unusual letters and theories received by the observatory circa 1915–1935. These letters were also collected in the book No One May Ever Have the Same Knowledge Again: Letters to Mt. Wilson Observatory 1915–1935 (ISBN 0-9647215-0-3).

* The historic monument came under threat during the August 2009 California wildfires.

* The poet Alfred Noyes was present for the "first light" of the Hooker telescope on November 2, 1917. Noyes used this night as the setting in the opening of Watchers of the Sky, the first volume in his trilogy The Torchbearers, an epic poem about the history of science. According to his account of the night, the first object viewed in the telescope was Jupiter and Noyes himself was the first to see one of the planet's moons through the telescope.