Subscribe
First Look

Countdown to Hubble's successor, James Webb Telescope, readies for launch

The biggest space telescope ever built is now complete despite previous financial setbacks and delays. After testing it is expected to launch in 2018.

  • close
    The James Webb Space Telescope Mirror is seen during a media unveiling at NASA’s Goddard Space Flight Center at Greenbelt, Md., Wednesday.
    Kevin Lamarque/Rueters
    View Caption
  • About video ads
    View Caption
of

The largest space telescope ever constructed is now complete and ready for testing, NASA officials announced on Wednesday.

The James Webb Space Telescope (JWST) is the successor to the Hubble Space Telescope, but with bigger mirrors and stronger capabilities. Expected to launch within two years, the telescope was an effort 20 years in the making that saw delayed deadlines and financial setbacks.

"Today, we're celebrating the fact that our telescope is finished, and we're about to prove that it works," John Mather, an astrophysicist and senior project scientist for the telescope said in a news conference as reported by Space.com. "We've done two decades of innovation and hard work, and this is the result – we're opening up a whole new territory of astronomy."

While its predecessor is credited with unveiling important discoveries including the acceleration of the universe’s expansion, the JWST is expected to go even further by exploring the birthplaces of planets, stars, and first galaxies born after the Big Bang more than 13.5 billion years ago with its sensitive infrared cameras. These observations will not only help scientists understand the origins of the universe but at the same time, look for signs of life in other planets.

"We'd like to know if another planet out there has enough water to have an ocean, and we think we can do that," Dr. Mather said on one of the project’s missions to explore the Alpha Centauri system, Popular Mechanics reports.

The $8.8 billion space telescope will be launched from French Guiana to a place called the second sun-Earth Lagrange point, located four times the distance between the Earth and the moon. It is equipped with mirrors 2.7 times bigger than Hubble’s and powerful detectors that can observe very infrared lights 400 times fainter than current space-based telescopes can see, as Space.com points out, even through cosmic dust and atmospheres of exoplanets.

For example, it will be able to "see a bumblebee a moon’s distance away," Mather said, "both in reflected light and in the body heat the bee emitted."

A five-layer sunshield the size of a tennis court will protect the telescope’s mirrors and instruments from the sun, Earth, moon, and its own electronics, with mirrors that will be kept at a temperature of minus 388 degrees F.

Recommended: Hubble: The people's telescope at 25

The next step before launch will be testing at multiple facilities and a final assembly in California to ensure the telescope can withstand the noise and shaking of a rocket launch. Unlike the Hubble, the telescope is not intended to be repaired once it is in orbit. The scientists expect it to be in orbit for 10 years. After it is launched, its large lenses will unfurl as it travels and be ready for experiments in six months time.

The JWST is the result of a collaboration between NASA, the European Space Agency, and the Canadian Space Agency. Originally scheduled for launch in 2013 at a cost of $5 billion, budget constraints nearly canceled the project. But with its completion and scheduled launch date in 2018, it is expected to join the Hubble in space.

Using both space telescopes at the same time, according to Ken Sembach, of the Space Telescope Science Institute (STScI), "really gives you a more panchromatic view of the universe than you would get just from Hubble alone, or just from Webb alone," The Christian Science Monitor previously reported.

About these ads
Sponsored Content by LockerDome
 
 
Make a Difference
Inspired? Here are some ways to make a difference on this issue.
FREE Newsletters
Get the Monitor stories you care about delivered to your inbox.
 

We want to hear, did we miss an angle we should have covered? Should we come back to this topic? Or just give us a rating for this story. We want to hear from you.

Loading...

Loading...

Loading...

Save for later

Save
Cancel

Saved ( of items)

This item has been saved to read later from any device.
Access saved items through your user name at the top of the page.

View Saved Items

OK

Failed to save

You reached the limit of 20 saved items.
Please visit following link to manage you saved items.

View Saved Items

OK

Failed to save

You have already saved this item.

View Saved Items

OK