Logo of Phnom Penh Post newspaper Phnom Penh Post - NASA's giant Webb telescope succeeds in key pre-launch test



NASA's giant Webb telescope succeeds in key pre-launch test

Content image - Phnom Penh Post
NASA's James Webb Space Telescope – the world's largest and most powerful space telescope is scheduled to launch into space in October. NASA/AFP

NASA's giant Webb telescope succeeds in key pre-launch test

The world's largest and most powerful space telescope unfolded its giant golden mirror for the last time on Earth on May 11, a key milestone before the $10 billion observatory is launched later this year.

The James Webb Space Telescope's 6.5m mirror was commanded to fully expand and lock itself into place, NASA said – a final test to ensure it will survive its 1.6-million-kilometre journey and is ready to discover the origins of the Universe.

Scott Willoughby of lead contractor Northrop Grumman said: "It's like building 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 [minus 240 Celsius], four times further than the Moon."

He was speaking at the company's spaceport in Redondo Beach, in the US state of 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 lift-off.

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 5m 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.

James Webb telescope programme scientist Eric Smith said Webb "has instrumentation that will propel this new and exciting field into its next epic of discovery".

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.

Smith said: "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."

MOST VIEWED

  • Hun Sen gets Covid, shuns G20, APEC summits

    Prime Minister Hun Sen said he has tested positive for Covid-19 in Indonesia, where he is slated to attend the G20 summit in his capacity of the ASEAN chair. In a social media post addressing the Cambodian public, he said: “Before leaving Cambodia, I always

  • Moody’s sets outlook rating to ‘negative’ for Cambodia

    US global rating agency Moody’s Investors Service Inc on November 15 announced that it downgraded Cambodia’s outlook from “stable” to “negative” and maintained its B2 local and foreign currency issuer ratings. “The negative outlook reflects a deteriorating external position as illustrated by the severe

  • Hong Kong firm done buying Coke Cambodia

    Swire Coca-Cola Ltd, a wholly-owned subsidiary of Hong Kong-listed Swire Pacific Ltd, on November 25 announced that it had completed the acquisition of The Coca-Cola Co’s bottling business in Cambodia, as part of its ambitions to expand into the Southeast Asian market. Swire Coca-Cola affirmed

  • Korean first lady paves way for ill boy’s surgery

    A 14-year-old boy with congenital heart disease who was lucky enough to meet with South Korean first lady Kim Keon-hee may get the chance of a lifetime and receive surgery and treatment at Asan Medical Center in Seoul, South Korea. After seeing his plight, many

  • Hun Sen’s Covid infection caused by ‘weakened antibody’ after summit

    Prime Minister Hun Sen said exhaustion from heavy workload before and during the recent ASEAN Summit may have led to him contracting Covid-19 due to his weakened immune system, while rejecting speculations that the infection was caused by leaders of some countries who did not

  • Kingdom’s rice crowned world’s No1

    Cambodia’s Phka Rumduol jasmine variety has been crowned the World’s Best Rice for the fifth time at the TRT (The Rice Trader) World Rice Conference in Phuket, Thailand on November 17, according to leaders of the Kingdom’s apex rice industry body. Phka Rumduol