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Home NASA

4 years after the enormous Arecibo Observatory collapsed, we lastly know what occurred

November 9, 2024
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4 years after the enormous Arecibo Observatory collapsed, we lastly know what occurred
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What does the discovery of a binary pulsar in 1974, the discovery of the primary exoplanets, and the most powerful message humans have ever sent out into space all have in frequent? All of them occurred on the Arecibo Observatory in Puerto Rico.

With a spherical reflector dish that was 305 meters (roughly 1000 ft) in diameter, Arecibo held the title of world’s largest radio telescope for over half a century — from its building in 1963 till 2016. To the dismay of astronomers world wide, in 2020, Arecibo’s reflector dish collapsed when assist cables gave method, resulting in the eventual decommissioning of one in all science’s most fruitful devices.

Not lengthy after the decommissioning, the Nationwide Science Basis and the College of Central Florida started an investigation into the first causes of the collapse — and after practically 4 years of investigation, the Committee tasked with discovering an evidence have finally released an official report detailing its findings.

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Within the report, the Committee writes:

“After analyzing the info and the intensive and detailed forensic investigations commissioned by the College of Central Florida and the Nationwide Science Basis (NSF), the committee consensus is that the basis explanation for the Arecibo Telescope’s collapse was unprecedented and accelerated long-term zinc creep induced failure of the telescope’s cable spelter sockets.”

The stories particulars how structural failure of the telescope probably started in 2017 when Hurricane Maria hit the Observatory which “subjected the Arecibo Telescope to winds between 105 and 118 mph … the winds of Hurricane Maria subjected the Arecibo Telescope’s cables to the very best structural stress they’d ever endured because it opened in 1963.”

Based on the report, inspections have been performed after the hurricane, however no important harm was deemed to have jeopardized the telescope’s structural integrity. Nonetheless, repairs have been nonetheless ordered — but these repairs have been delayed for years. And, because the investigation states, they have been focused “towards elements and substitute of a foremost cable that in the end by no means failed,” which suggests the repairs wouldn’t have prevented the eventual collapse of the Observatory’s reflector dish even when they weren’t delayed.

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Ultimately, in August and September of 2020, an auxiliary and foremost cable failed, main the NSF to announce the decommissioning of the telescope by a managed demolition. Extra assist cables gave method on Dec. 1, 2020, inflicting the instrument platform to break down into the dish itself. Fortunately, nobody was injured by the cable failures.

The report continued to element how hidden outer wire failures triggered the collapse, which had fractured resulting from shear stress from zinc creep (or zinc decay) within the telescope’s cable spelter sockets. Sadly, this difficulty was not recognized throughout the post-Maria inspection, which meant engineers hadn’t thought-about the degradation of those mechanisms as a supply of a possible future collapse.

Regardless of Arecibo’s discovery days being over, the observatory might be remade right into a schooling heart often known as Arecibo C3. Hopefully, the decommissioned observatory can encourage the following technology of astronomers to make discoveries as impactful as these made at Arecibo throughout its days peering out into the universe.



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