The US National Science Foundation has announced it will close down the massive space telescope at Puerto Rico's Arecibo Observatory, ending 57 years of astronomical discoveries after suffering two destructive mishaps in recent months.
Operations at the observatory, one of the largest in the world, were halted in August when one of its supportive cables slipped loose from its socket, falling and gashing a 30-metre-long hole in its 300-metre-wide reflector dish.
Another cable then broke earlier this month, tearing a new hole in the dish and damaging nearby cables as engineers scrambled to devise a plan to preserve the crippled structure.
“NSF has concluded that this recent damage to the 305-metre telescope cannot be addressed without risking the lives and safety of work crews and staff," Sean Jones, assistant director of the Mathematical and Physical Sciences Directorate at NSF, said on Thursday.
"NSF has decided to begin the process of planning for a controlled decommissioning of the telescope,” Jones said.
Engineers have not yet determined the cause of the initial cable's failure, a NSF spokesperson said.
The observatory’s vast reflector dish and a 900-tonne structure hanging 450 feet above it, nestled in the humid forests of Arecibo, Puerto Rico, had been used by scientists and astronomers around the world for decades to analyse distant planets, find potentially hazardous asteroids and hunt for signatures of extraterrestrial life.
The telescope was instrumental in detecting the near-Earth asteroid Bennu in 1999, which laid the groundwork for Nasa to send a robotic probe there to collect and eventually return its first asteroid dirt sample some two decades later.
An engineering firm hired by the University of Central Florida, which manages the observatory for NSF under a five-year $20 million agreement, concluded in a report to the university last week “that if an additional main cable fails, a catastrophic collapse of the entire structure will soon follow.”
Citing safety concerns, the firm ruled out efforts to repair the observatory and recommended a controlled demolition.
What is blockchain?
Blockchain is a form of distributed ledger technology, a digital system in which data is recorded across multiple places at the same time. Unlike traditional databases, DLTs have no central administrator or centralised data storage. They are transparent because the data is visible and, because they are automatically replicated and impossible to be tampered with, they are secure.
The main difference between blockchain and other forms of DLT is the way data is stored as ‘blocks’ – new transactions are added to the existing ‘chain’ of past transactions, hence the name ‘blockchain’. It is impossible to delete or modify information on the chain due to the replication of blocks across various locations.
Blockchain is mostly associated with cryptocurrency Bitcoin. Due to the inability to tamper with transactions, advocates say this makes the currency more secure and safer than traditional systems. It is maintained by a network of people referred to as ‘miners’, who receive rewards for solving complex mathematical equations that enable transactions to go through.
However, one of the major problems that has come to light has been the presence of illicit material buried in the Bitcoin blockchain, linking it to the dark web.
Other blockchain platforms can offer things like smart contracts, which are automatically implemented when specific conditions from all interested parties are reached, cutting the time involved and the risk of mistakes. Another use could be storing medical records, as patients can be confident their information cannot be changed. The technology can also be used in supply chains, voting and has the potential to used for storing property records.
More from our neighbourhood series:
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South Africa v India schedule
Tests: 1st Test Jan 5-9, Cape Town; 2nd Test Jan 13-17, Centurion; 3rd Test Jan 24-28, Johannesburg
ODIs: 1st ODI Feb 1, Durban; 2nd ODI Feb 4, Centurion; 3rd ODI Feb 7, Cape Town; 4th ODI Feb 10, Johannesburg; 5th ODI Feb 13, Port Elizabeth; 6th ODI Feb 16, Centurion
T20Is: 1st T20I Feb 18, Johannesburg; 2nd T20I Feb 21, Centurion; 3rd T20I Feb 24, Cape Town
Friday's schedule at the Etihad Airways Abu Dhabi Grand Prix
GP3 qualifying, 10:15am
Formula 2, practice 11:30am
Formula 1, first practice, 1pm
GP3 qualifying session, 3.10pm
Formula 1 second practice, 5pm
Formula 2 qualifying, 7pm
Bharat
Director: Ali Abbas Zafar
Starring: Salman Khan, Katrina Kaif, Sunil Grover
Rating: 2.5 out of 5 stars
UAE currency: the story behind the money in your pockets
The specs
Engine: 4.0-litre, twin-turbocharged V8
Transmission: nine-speed automatic
Power: 630bhp
Torque: 900Nm
Price: Dh810,000
Abu Dhabi race card
5pm Abu Dhabi Fillies Classic Prestige | Dh110,000 | 1,400m
5.30pm Abu Dhabi Colts Classic Prestige | Dh110,000 | 1,400m
6pm Abu Dhabi Championship Listed | Dh180,000 | 1,600m
6.30pm Maiden | Dh80,000 | 1,600m
7pm Wathba Stallions Cup Handicap | Dh80,000 | 1,400m
7.30pm Handicap (TB) |Dh100,000 | 2,400m
THE SPECS
Engine: 2.0-litre four-cylinder turbo
Transmission: eight-speed automatic
Power: 258hp at 5,000-6,500rpm
Torque: 400Nm from 1,550-4,400rpm
Fuel economy, combined: 6.4L/100km
Price, base: from D215,000 (Dh230,000 as tested)
On sale: now
BUNDESLIGA FIXTURES
Friday (UAE kick-off times)
Cologne v Hoffenheim (11.30pm)
Saturday
Hertha Berlin v RB Leipzig (6.30pm)
Schalke v Fortuna Dusseldof (6.30pm)
Mainz v Union Berlin (6.30pm)
Paderborn v Augsburg (6.30pm)
Bayern Munich v Borussia Dortmund (9.30pm)
Sunday
Borussia Monchengladbach v Werder Bremen (4.30pm)
Wolfsburg v Bayer Leverkusen (6.30pm)
SC Freiburg v Eintracht Frankfurt (9on)
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