The renowned Arecibo Observatory radio telescope in Puerto Rico that has played a key role in astronomical discoveries for more than half a century has collapsed.
A cable holding up a 900-ton receiver platform snapped, which sent the massive hurling onto the reflector dish more than 400 feet below around 8am local time Tuesday morning.
Arecibo Observatory was set to close after auxiliary cable snapped in August that caused a 100-foot gash on the 1,000-foot-wide dish and damaged the receiver platform that hung above it.
Then a main cable broke in early November sealing the iconic telescope's fate - officials were set to shut it down after 57 years of service.
Arecibo Observatory is known for detecting whirling pulsars, capturing geological features of Mars and helping astronomers discover the near-Earth asteroid Bennu.
The recent collapse has left many scientists stunned who had relied on, what was until recently, the largest radio telescope in the world.
'It sounded like a rumble. I knew exactly what it was,' said Jonathan Friedman, who worked for 26 years as a senior research associate at the observatory and still lives near it.
'I was screaming. Personally, I was out of control.... I don't have words to express it. It's a very deep, terrible feeling.'
After hearing the distant roar, Friedman said he ran up a small hill near his home and saw a thick cloud of dust hanging over the location of the telescope - confirming his suspicions and greatest fear.
The renowned Arecibo Observatory radio telescope in Puerto Rico that has played a key role in astronomical discoveries for more than half a century has collapsed. A cable holding up a 900-ton receiver platform snapped, which sent the massive hurling onto the reflector dish more than 400 feet below
No one was near the dish when the platform collapsed, but officials have heard details on the event.
Ramon Lugo, director of the Florida Space Institute at the University of Central Florida, which manages the telescope, believes one of the remaining cables holding the platform to one of three support towers gave out due to the intense stress.
Lugo also said that since Thanksgiving, a number of wires were starting to break and told NSF the structure was doomed to collapse in a week or two.
'It's a huge loss,' said Carmen Pantoja, an astronomer and professor at the University of Puerto Rico who used the telescope for her doctorate. 'It was a chapter of my life.'
Scientists had feared the telescope would collapse in a week or two due to the mechanical issues this year. Pictured is an aerial view of the destruction
Then a main cable broke in early November sealing the iconic telescope's fate. The recent collapse has left many scientists stunned who had relied on, what was until recently, the largest radio telescope in the world. Twitter users are also mourning the collapse and sharing images that show the thick smoke following the cable breaking
Twitter users have shared images of the fallen telescope. This image shows the cable intact (bottom). The top image shows the day after with the platform missing
When news first surfaced that the telescope would be closed, scientists around the world banned together to petition US officials and revers US National Science Foundation (NSF) decision to shutdown the observatory.
The NSF had previously planned reopen the visitor center and restore operations at the intact assets, including two LIDAR facilities used for upper atmospheric and ionospheric research that analyzes such things as cloud cover and precipitation data.
The telescope was built in the 1960s with money from the Defense Department amid a push to develop anti-ballistic missile defenses.
Arecibo Observatory was set to close after auxiliary cable snapped in August that caused a 100-foot gash on the 1,000-foot-wide dish and damaged the receiver platform that hung above it. Then a main cable broke in early November sealing the iconic telescope's fate - officials were set to shut it down after 57 years of service
Broken cables (pictured) tore holes in the structure leading to the final decision to decommission Arecibo. Picture was taken on November 7
The telescope has been used to track asteroids on a path to Earth, conduct research that led to a Nobel Prize and determine if a planet is potentially habitable. It served as a training ground for graduate students and drew about 90,000 visitors a year and was featured in the 1995 James Bond film GoldenEye (pictured)
Arecibo had endured hurricanes, tropical humidity and a recent string of earthquakes in its 57 years of operation, but it was mechanical failures that brought it down.
The telescope has been used to track asteroids on a path to Earth, conduct research that led to a Nobel Prize and determine if a planet is potentially habitable.
It served as a training ground for graduate students and drew about 90,000 visitors a year and was featured in the 1995 James Bond film GoldenEye.
Damage in August done by a broken cable that supported a metal platform, creating a 100-foot (30-meter) gash to the radio telescope's reflector dish in Arecibo, Puerto Rico
'I am one of those students who visited it when young and got inspired,' said Abel Méndez, a physics and astrobiology professor at the University of Puerto Rico at Arecibo who has used the telescope for research.
'The world without the observatory loses, but Puerto Rico loses even more.'
Méndez last used the telescope on August 6, just days before a socket holding the auxiliary cable that snapped failed in what experts believe could be a manufacturing error.
The NFS, which owns the observatory that is managed by the University of Central Florida, said crews who evaluated the structure after the first incident determined that the remaining cables could handle the additional weight.
But on November 6, another cable broke that was holding up the damaged structure.
No one was near the dish when the platform collapsed, but officials have heard details on the event. Officials believes one of the remaining cables holding the platform to one of three support towers gave out due to the intense stress. Pictured is the telescope before that platform was dropped onto the reflector dish
A spokesman for the observatory said there would be no immediate comment, and a spokeswoman for the University of Central Florida did not return requests for comment.
Scientists had used the telescope to study pulsars to detect gravitational waves as well as search for neutral hydrogen, which can reveal how certain cosmic structures are formed. A
About 250 scientists worldwide had been using the observatory when it closed in August, including Méndez, who was studying stars to detect habitable planets.
'I'm trying to recover,' he said. 'I am still very much affected.'
ARECIBO OBSERVATORY HISTORY
1963: Arecibo Ionospheric Observatory Commissioned for service on November 1 for $9.7 million.
1965: One of its first accomplishments was establishing the rotation rate of Mercury, which turned out to be 59 days rather than the previously estimated 88 days.
1968: Sporadic radio pulses from the direction of the Crab Nebula supernova remnant found at Green Bank were shown by Arecibo to come from a 33-ms period pulsar situated at the centre of the nebula.
1974: New high precision surface reflector installed, planetary radar transmitter installed.
1974: The first pulsar in a binary system was discovered, leading to important confirmation of Einstein's theory of general relativity and a Nobel Prize 1993 for astronomers Russell Hulse and Joseph Taylor.
1974: On 16 November, the 'Arecibo message' was broadcast into space toward the globular star cluster M13 25,000 light years away.
The message's main purpose was to demonstrate the capabilities of newly installed equipment in the upgraded radio telescope and was an attempt to contact extraterrestrial intelligence.
1979: A large, anomalous travelling ionospheric disturbance (that is, an upper atmosphere wave) moving southeast to northwest was detected in the early morning hours - something researchers had never before witnessed. Data helped define the probable cause as an air nuclear blast over the Indian Ocean.
1981: First radar maps of the geologic surface of Venus are produced.
1982: The discovery of strong 'megamaser' emission from the hydroxyl (OH) molecule in the starburst galaxy Arp 220 (IC 4553).
1982: The discovery of millisecond pulsars, which rotate several hundred times per second. This demonstrated the existence of two classes of pulsars - the millisecond pulsars and the slower-rotating pulsars, which rotate about once per second.
1989: The first measurement of hydrogen escape flux from Earth is presented, based on velocity distribution measurements of the hydrogen airglow emission in the upper atmosphere.
Early 90s: The first planets outside the solar system were discovered around Pulsar B1257+12, a rapidly rotating pulsar with three Earth-like planets in orbit.
1992: In October, ice is discovered in shadowed craters at Mercury's north pole. Later observations show ice in south pole craters as well.
1996: A layer of helium ions is shown to be a common, but previously unrecognised feature in the low-latitude ionosphere near 600 km.
1998: Arecibo Observatory 'found' the Solar and Heliospheric Observatory (SOHO) spacecraft on July 28, after it lost communications with European Space Agency and NASA,. by bouncing a radar signal off the satellite. SOHO's mission was resumed and continues to produce data today.
May 2000: Radar Observations of Asteroid 216 Kleopatra reveal a 'dog bone' shaped metal-rich object.
September 2000: Discovery that 2000 DP107 was the first near-Earth asteroid identified by radar as a binary system. The primary is roughly spherical with a diameter of a half mile and the smaller secondary, which orbits it in 1.8 days, is about 1000 feet.
2003: Evidence for hydrocarbon lakes on the Saturn satellite Titan is established using the Observatory planetary radar.
April 2004: Installation of the Arecibo L-band Feed Array, enabling a wide variety of astronomical surveys including discovering pulsars, mapping the gas in our Galaxy, and searches for other galaxies.
2005-2012: Radar imaging of Mars reveals lava flows and near-surface geologic features not seen in visible images. This provides new insights into Mars surface geology.
2006: Search for water ice in the permanent shadow of the lunar Shackleton Crater disputes evidence for water ice on the lunar surface.
October 2006: Radar images of the south pole of the moon reveal no evidence for thick deposits of ice.
November 2006: Radar images of binary asteroid (66391) 1999 KW4 in May 2001 and again in June 2002 reveal exotic physical and dynamical properties which may be common among near-Earth binaries.
March 2007: Radar images of Mercury reveal features to be studied further by the Messenger spacecraft over the next several years.
2007: The near-Earth asteroid 2005 PH5 was observed to be increasing in spin rate, due to non-uniform absorption and emission of solar radiation.
2007: Previously undetected radio lines of the molecule hydrogen cyanide (HCN), and the presence of the molecule methanimine (CH2NH), were recently discovered in the distant 'starburst galaxy' Arp 220.
February 2008: Discovery of the first triple asteroid system among the near-Earth asteroids. The asteroid, 2001 SN263, is about 1.5 miles in diameter, with two moons orbiting it.
2008–2012: Observations discover a radio outburst in the nearby galaxy NGC 660, ten times brighter than a radio supernova.
2011: Observations of brown dwarfs find the coldest star to show radio emission.
November 2011: Radar imaging of near-Earth asteroid 2005 YU55, which made a very close flyby. This dark, spheroidal asteroid was found 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 above 62 miles altitudes.
More info: National Astronomy and Ionosphere Center