Image: Webb Telescope's 'silver and gold decorations'

December 22, 2017 by Eric Villard, NASA
This image mashup highlights two achievements NASA’s James Webb Space Telescope had in 2017. In October, Webb’s sunshield was tensioned for the first time at Northrop Grumman Aerospace Systems in Redondo Beach, California. In November, Webb’s combined optics and science instruments completed cryogenic testing inside Chamber A at NASA’s Johnson Space Center in Houston. Credit: NASA/Chris Gunn

Webb telescope, or Webb, is NASA's upcoming infrared space observatory, which will launch in 2019. The two photos that compose this image highlight two important achievements Webb had in the latter part of 2017.

In early December, Webb's combined optical element and science instruments emerged from Chamber A at NASA's Johnson Space Center in Houston, where it successfully completed . During testing, scientists and engineers at Johnson put Webb through a series of tests designed to ensure the telescope functioned as expected in an extremely cold, airless environment akin to that of .

Webb's primary mirror consists of 18 beryllium mirror segments, and each segment is gilded with a tiny amount of gold—about a golf ball's worth for the entire mirror. Each mirror segment was gilded through a process called vacuum vapor deposition, where a miniscule amount of the precious metal is vaporized and deposited on each segment inside of a vacuum chamber.

In October, Webb's tennis court-sized, five-layer, deployable was fully tensioned at Northrop Grumman Aerospace Systems in Redondo Beach, California. During the tensioning process, engineers at Northrop carefully and deliberately stretched the sunshield to its fully deployed position. This was the first of several tensioning sessions the sunshield will undergo.

NASA’s James Webb Space Telescope emerged from Chamber A at NASA’s Johnson Space Center in Houston on Dec. 1, 2017. Credit: NASA/Mike McClare

Though the sunshield appears silver, each layer is actually coated with reflective aluminum. The sunshield is composed of what are essentially sheets of special plastic that maintain their integrity at extreme temperatures. Each sunshield layer is only about 1/1000th of an inch thick.

These two halves of the James Webb Space Telescope observatory—Webb's combined science instruments and optics, and its combined spacecraft bus and sunshield (called the spacecraft element)—will be integrated at Northrop Grumman in 2018. Webb will launch from Kourou, French Guiana in 2019.

Webb's eventful year

These most recent accomplishments were among several Webb had for 2017. In March, the telescope's combined optics and completed acoustic and vibration testing at NASA's Goddard Space Flight Center in Greenbelt, Maryland, before moving to Johnson for cryogenic testing.

Engineers at Northrop Grumman Aerospace Systems in Redondo Beach, California, tensioned the sunshield of NASA’s James Webb Space Telescope for the first time in October 2017. Credit: Northrop Grumman

"This was a pivotal year for Webb. With launch environment and cryogenic testing completed, we have demonstrated our science payload functions as planned," said Eric Smith, program director for Webb telescope at NASA. "In 2018, the telescope will meet up with the other iconic and now completed component of Webb, its sunshield and spacecraft, to form the observatory."

On the scientific front, September saw worldwide participation from the science community for the Director's Discretionary Early Release Science (DD-ERS) program, and in November, NASA announced the proposals it selected for the DD-ERS program. The science observations for these proposals will be completed within the first five months of Webb's science observations.

"Though there is still observatory testing ahead of us, the response this year from the community for Early Release Science shows that there are exciting questions already queued up for Webb to answer," Smith said.

The James Webb Space Telescope is the world's premier infrared of the next decade. A barrier-breaking mission for engineers and astronomers, Webb will solve mysteries of our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, the European Space Agency (ESA), and the Canadian Space Agency (CSA).

Explore further: NASA's Webb telescope emerges from Chamber A

Related Stories

NASA's Webb telescope emerges from Chamber A

December 1, 2017

NASA's James Webb Space Telescope, or Webb, emerged from Chamber A at NASA's Johnson Space Center in Houston on Dec. 1 to prepare for its upcoming move to California.

NASA's Webb Telescope summertime deep-freeze continues

August 9, 2017

NASA's James Webb Space Telescope began a nearly 100-day cryogenic test in a giant chamber in Texas in mid-July. Components of the Webb have previously endured similar tests to ensure they would function in the cold environment ...

Recommended for you

Lyman-alpha emission detected around quasar J1605-0112

February 20, 2018

Using the Multi Unit Spectroscopic Explorer (MUSE) instrument astronomers have discovered an extended and broad Lyman-alpha emission in the form of a nebula around the quasar J1605-0112. The finding is reported February 9 ...

'Ultramassive' black holes discovered in far-off galaxies

February 20, 2018

Thanks to data collected by NASA's Chandra X-ray telescope on galaxies up to 3.5 billion light years away from Earth, an international team of astrophysicists has detected what are likely to be the most massive black holes ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.