The Arecibo Observatory will be rebuilt as Puerto Rico commits $ 8 million for its reconstruction

1963: The Arecibo Ionospheric Observatory was commissioned for service on November 1 for $ 9.7 million.

1965One of his first achievements was to set the rotation rate of mercury, which turned out to be 59 days rather than the previously estimated 88 days.

1968: Sporadic radio pulses in the direction of the Crab Nebula’s supernova remnant found at Green Bank showed Arecibo to come from a 33 ms pulsar located in the center of the nebula.

1974: New high-precision surface reflector installed, planetary radar transmitter installed.

1974: The first pulsar in a binary system was discovered, which led to important confirmation of Einstein’s theory of general relativity and a 1993 Nobel Prize for astronomers Russell Hulse and Joseph Taylor.

1974: On November 16, the “Arecibo message” was broadcast into space to the M13 globular star cluster 25,000 light-years away.

The main purpose of the message was to demonstrate the capabilities of newly installed equipment in the modernized radio telescope and was an attempt to contact extraterrestrial information.

1979: A large, abnormal ionospheric travel disturbance (ie an upper wave of the atmosphere) moving southwest to northwest was detected in the early hours of the morning – which the researchers had not witnessed. The data helped define the probable cause as an aerial nuclear explosion over the Indian Ocean.

1981: The first radar maps of the geological surface of Venus are produced.

1982: Discovery of a strong “megamaser” emission from the hydroxyl (OH) molecule in the galaxy Arp 220 (IC 4553).

1982: Detection of millisecond pulses, which rotate several hundred times per second. This demonstrated the existence of two classes of pulsars – millisecond pulsars and slower-rotating pulsars, which rotate about once per second.

1989: The first measurement of the flow of hydrogen from Earth is presented, based on the measurements of the distribution of the speed of light emissions of hydrogen air into the upper atmosphere.

In the early 1990s: The first planets outside the solar system were discovered around the B1257 + 12 pulsar, a fast-rotating pulsar with three Earth-like planets in orbit.

1992: In October, ice is discovered in shady craters at the north pole of Mercury. Subsequent observations also show ice in the craters of the South Pole.

1996: A layer of helium ions has proven to be a common but previously unrecognized feature in the low-latitude ionosphere of nearly 600 km.

1998: The Arecibo Observatory “found” the spacecraft Solar and Heliosphere Observatory (SOHO) on July 28, after losing communications with the European Space Agency and NASA. by rejecting a radar signal from the satellite. The SOHO mission was resumed and continues to produce data today.

May 2000: Radar observations from asteroid 216 Kleopatra reveal a metal object rich in the shape of a “dog bone”.

September 2000: Discovery that 2000 DP107 was the first near-Earth asteroid identified by radar as a binary system. The primary is approximately spherical with a diameter of half a mile, and the smaller secondary, which orbits it in 1.8 days, is about 1000 feet.

2003: Evidence for hydrocarbon lakes on the Saturn Titan satellite is established using the Observatory’s planetary radar.

April 2004: Installation of the Arecibo L-band Feed Array, allowing a wide variety of astronomical soundings, including pulsar discovery, gas mapping in our galaxy, and searching for other galaxies.

2005-2012: The radar image of Mars reveals lava flows and geological features from the surface unseen in visible images. It provides new information about the geology of the surface of Mars.

2006: Look for water ice in the permanent shadow of the monthly Shackleton crater disputes evidence of water ice on the lunar surface.

October 2006: Radar images of the moon’s south pole reveal no evidence of thick ice deposits.

November 2006: Radar images of the binary asteroid (66391) 1999 KW4 in May 2001 and again in June 2002 reveal exotic physical and dynamic properties that may be common among binaries near Earth.

March 2007: Mercury’s radar images reveal features that will be further studied by the Messenger spacecraft over the next few years.

2007: The asteroid near Earth 2005 PH5 has been observed to increase in centrifugal rotation due to uneven absorption and emissions of solar radiation.

2007: The previously undetected radio lines of the hydrogen cyanide molecule (HCN) and the presence of the methanmin molecule (CH2NH) were recently discovered in the distant “starburst galaxy” Arp 220.

February 2008: Discovery of the first triple asteroid system among asteroids near Earth. The asteroid, 2001 SN263, is about 1.5 miles in diameter, with two months orbiting it.

2008-2012: Observations reveal a radio explosion in the nearby galaxy NGC 660, ten times brighter than a radio supernova.

2011: Observations of brown dwarfs find the coldest star that shows radio broadcasts.

November 2011: Radar image of the asteroid near Earth 2005 YU55, which made a very close flight. This dark spheroidal asteroid turned out to be about 1,148 feet in diameter.

2012: An ion-neutral chemistry model is developed to successfully describe thin layers of neutral metal atoms at altitudes above 62 miles.

More information: National Center for Astronomy and Ionosphere