2020年8月13日(木)
The observatory’s original launch date was 2010
Last September, NASA announced it was delaying Webb’s launch from 2018 to 2019.The review board has issued 32 recommendations and NASA intends to implement them all, officials said. Worker morale also took a hit as the problems mounted; the team had limited time off because of excessive overtime, the board said.These are just some of the “seemingly small” mistakes that could and should have been avoided, the board said.Zurbuchen said NASA should have been providing better oversight and is part of the problem along with Northrop Grumman.NASA’s next-generation space telescope has been delayed yet again at a staggering cost of $1 million a day. Development cost alone will exceed the $8 billion cap set by Congress by more than $800 million and require authorisation. Mission success is our number one priority,” spokesman Tim Paynter said in a statement.
He warned the new date does not allow for any more major problems or mistakes, or extra excessive testing. Besides improved oversight, he said there will be more quality control and more NASA engineers will be taking part in everything moving forward.The telescope’s overall cost is now expected to reach nearly $10 billion. The valves had to be repaired or replaced.In a vibration test of the telescope earlier this year in California by prime contractor Northrop Grumman, dozens of loose fasteners — some 70 pieces in all — came off. The observatory will now fly no earlier than 2021; until last fall, it was on the books for a 2018 launch. Then in March, the launch was postponed from 2019 to 2020.“We have to get this right here on the ground before we go to space,” Zurbuchen said.For the third time in less than a year, the space agency announced a lengthy postponement Wednesday for the James Webb Space Telescope.“Make no mistake, I’m not happy sitting here having to share this story.Spacecraft sensors were also zapped with excess voltage due to improper wiring.
Despite the many problems, the review board urges that the project continues given its “compelling” scientific potential and national importance. Its sun shield, the size of a tennis court once unfurled in space, is needed to keep the infrared telescope cold and is a major risk area, he said.The observatory’s original launch date was 2010 and the cost under $1 billion. The loose and lost nuts and bolts alone were enough to bump the mission into 2021, officials noted.NASA repeatedly was over-optimistic in the work schedule, especially given the complexities and unique features of the Webb telescope, Young said. The lock nuts were not tightened properly before the test, according to a report by the board.6 million kilometres) from Earth, unreachable by astronauts like the low-orbiting Hubble — launched in 1990 with a misshapen mirror — was.The 29-month delay from 2018 to 2021 represents a $1 billion hit — not including the cost of implementing the board’s recommendations. We never want to do this. It will operate from a point 1 million miles (1. “Webb is worth the wait.“The complexity and risk cannot be overstated or overestimated,” he said.
Now it’s March 30, 2021.In another mishap, the wrong solvent was used to clean spacecraft propulsion valves.Young said if the board’s recommendations are “rigorously implemented,” then the newest date is feasible. We always want to talk about the successes that we have,” said NASA’s science mission chief Thomas Zurbuchen.“We will not sacrifice quality for schedule. No one bothered checking to stainless steel fasteners suppliers see whether the cleaner might damage the equipment, said review board chairman Tom Young. The company said it has changed the way it works to prevent future issues. It was named after NASA’s second administrator, who spearheaded the Apollo moon landings.Webb — considered a successor to the Hubble Space Telescope — is meant to peer farther into space and deeper into time than ever before. A few pieces are still missing and could well be inside the observatory.An independent review board cites worker error and embedded hardware problems for much of the escalating costs and delays.”Northrup Grumman acknowledged that problems have put the project behind schedule. The inspector on duty relied on the technician’s word that he’d wired it correctly and did not double-check the work, the board said.
He warned the new date does not allow for any more major problems or mistakes, or extra excessive testing. Besides improved oversight, he said there will be more quality control and more NASA engineers will be taking part in everything moving forward.The telescope’s overall cost is now expected to reach nearly $10 billion. The valves had to be repaired or replaced.In a vibration test of the telescope earlier this year in California by prime contractor Northrop Grumman, dozens of loose fasteners — some 70 pieces in all — came off. The observatory will now fly no earlier than 2021; until last fall, it was on the books for a 2018 launch. Then in March, the launch was postponed from 2019 to 2020.“We have to get this right here on the ground before we go to space,” Zurbuchen said.For the third time in less than a year, the space agency announced a lengthy postponement Wednesday for the James Webb Space Telescope.“Make no mistake, I’m not happy sitting here having to share this story.Spacecraft sensors were also zapped with excess voltage due to improper wiring.
Despite the many problems, the review board urges that the project continues given its “compelling” scientific potential and national importance. Its sun shield, the size of a tennis court once unfurled in space, is needed to keep the infrared telescope cold and is a major risk area, he said.The observatory’s original launch date was 2010 and the cost under $1 billion. The loose and lost nuts and bolts alone were enough to bump the mission into 2021, officials noted.NASA repeatedly was over-optimistic in the work schedule, especially given the complexities and unique features of the Webb telescope, Young said. The lock nuts were not tightened properly before the test, according to a report by the board.6 million kilometres) from Earth, unreachable by astronauts like the low-orbiting Hubble — launched in 1990 with a misshapen mirror — was.The 29-month delay from 2018 to 2021 represents a $1 billion hit — not including the cost of implementing the board’s recommendations. We never want to do this. It will operate from a point 1 million miles (1. “Webb is worth the wait.“The complexity and risk cannot be overstated or overestimated,” he said.
Now it’s March 30, 2021.In another mishap, the wrong solvent was used to clean spacecraft propulsion valves.Young said if the board’s recommendations are “rigorously implemented,” then the newest date is feasible. We always want to talk about the successes that we have,” said NASA’s science mission chief Thomas Zurbuchen.“We will not sacrifice quality for schedule. No one bothered checking to stainless steel fasteners suppliers see whether the cleaner might damage the equipment, said review board chairman Tom Young. The company said it has changed the way it works to prevent future issues. It was named after NASA’s second administrator, who spearheaded the Apollo moon landings.Webb — considered a successor to the Hubble Space Telescope — is meant to peer farther into space and deeper into time than ever before. A few pieces are still missing and could well be inside the observatory.An independent review board cites worker error and embedded hardware problems for much of the escalating costs and delays.”Northrup Grumman acknowledged that problems have put the project behind schedule. The inspector on duty relied on the technician’s word that he’d wired it correctly and did not double-check the work, the board said.
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