This NASA photo released on May 16, 2017 shows the primary mirror of NASA’s James Webb Space Telescope inside a cleanroom at NASA’s Johnson Space Center in Houston,Texas Photograph:( AFP )
The James Webb Space Telescope which has been peering into the universe for more than 30 years, had been down for a few days last month
NASA's golden-mirrored James Webb Space Telescope has passed a key review this week, a key milestone before the $10 billion observatory is launched later this year.
The telescope, which has been peering into the universe for more than 30 years, had been down for a few days last month.
NASA said initial evidence pointed to a degrading computer memory module as the source of the computer problem.
The technology for the payload computer dates back to the 1980s, and it was replaced during maintenance work in 2009.
The James Webb Space Telescope's 21 feet 4 inches (6.5 meters) mirror was commanded to fully expand and lock itself into place, NASA said, a final test to ensure it will survive its million-mile (1.6 million kilometers) journey and is ready to discover the origins of the Universe.
Scott Willoughby, the lead contractor Northrop Grumman, had defined building it as a ''Swiss watch at 40-feet-tall... and getting it ready for this journey that we take into the vacuum at minus 400 degrees Fahrenheit (-240 Celsius), four times further than the Moon."
He was speaking at the company's spaceport in Redondo Beach, California, from where the telescope will be shipped to French Guiana to be launched on an Ariane 5 rocket, with NASA targeting October 31 for liftoff.
NASA continues to work to resolve an issue with the payload computer on the Hubble Space Telescope, which halted on June 13.— Hubble (@NASAHubble) June 18, 2021
Launched in 1990, Hubble has contributed greatly to our understanding of the universe over the past 30 years. https://t.co/qEmIUQCtuX
Webb's primary mirror is made of 18 hexagonal segments coated with an ultra-thin layer of gold to improve its reflection of infrared light.
It will fly to space folded like a piece of origami artwork, which allows it to fit inside a 16-foot (5-meter) rocket fairing, and will then use 132 individual actuators and motors to bend each mirror into a specific position.
Together, the mirrors will function as one massive reflector, to enable the telescope to peer deeper into the cosmos than ever before.
Scientists want to use the telescope to look back in time over 13.5 billion years ago and see for the first time the first stars and galaxies that formed, a few hundred million years after the Big Bang.
To do this, they need to detect infrared. The current premier space telescope, Hubble, only has limited infrared capacity.
This is key because, by the time the light from the first objects reaches our telescopes, it has been shifted towards the red end of the electromagnetic spectrum as a result of the Universe extending the space between objects as it expands.
Another key area will be the discovery of alien worlds. The first planets to orbit other stars were detected in the 1990s and there are now more than 4,000 exoplanets that have been confirmed.
Webb "has instrumentation that will propel this new and exciting field into its next epic of discovery," said Eric Smith, James Webb telescope program scientist.
Scientists from 44 countries will be able to make use of the telescope, with proposals including using the infrared capabilities to penetrate the supermassive black holes at the centre of galaxies, including our own.
"The discovery capability of Webb is limited only by our own imaginations, and scientists around the world will soon be using this general-purpose observatory to take us places we haven't dreamed of going before," said Smith.
(With inputs from agencies)