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Nasa workers inspect the James Webb space telescope during its media launch at the Goddard Space Flight Center in Greenbelt, Maryland, the US, November 2 2016. Picture: KEVIN LAMARQUE/REUTERS
Nasa workers inspect the James Webb space telescope during its media launch at the Goddard Space Flight Center in Greenbelt, Maryland, the US, November 2 2016. Picture: KEVIN LAMARQUE/REUTERS

Washington  — It was finished years late at a cost far higher than planned, but Nasa’s James Webb space telescope due for launch this week may usher in a new era in astronomy as it gathers information on the universe’s earliest stages, star formation and whether planets beyond our solar system may be suitable for life.

The much-delayed orbiting infrared observatory, designed to be about 100 times more sensitive than its Hubble space telescope predecessor, is now due to blast off on December 24 on an Ariane 5 rocket from a site in French Guiana on South America’s northeastern coast. It will be the largest and most powerful telescope ever to be launched into space. 

“The James Webb space telescope is confirmed for the target launch date of December 24,” tweeted launch company Arianespace.

Confirming the launch date, Nasa tweeted that the telescope was “encapsulated inside its @Ariane5 rocket fairing”.

Webb project scientist the Space Telescope Science Institute in Baltimore said: “We’re about to go on this amazing journey of discovery. We really mean discovery because Webb has the raw power to reveal the unexpected. We can plan what we think we’re gong to see. But at the end of the day we know that nature will surprise us more often than not.”

The telescope is an international collaboration led by Nasa in partnership with the European and Canadian space agencies. Northrop Grumman Corporation is the primary contractor. The launch vehicle is part of the European contribution.

It was developed at a cost of $8.8bn, with operational expenses projected to bring its total price tag  to about $9.66bn. The US government accountability office said the price has nearly doubled  since Nasa established a cost baseline in 2009 after earlier cost overruns. Nasa had hoped to launch it in 2011, but the date was repeatedly delayed.

Scientists plan to use the telescope to learn about all phases of the universe’s history dating back to just after the Big Bang event about 13.8-billion years ago, while also studying exoplanets — planets beyond our solar system — as well as worlds closer to home such as our planetary neighbour Mars and Saturn’s moon Titan.

Webb will look at the universe in the infrared, while Hubble has examined it since its 1990 launch primarily at optical and ultraviolet wavelengths. Webb has a much bigger light-collecting area, letting it look at greater distances, thus farther back into time, than Hubble.

“We’re looking forward to this and we’re getting very, very close,” said Greg Robinson, Webb’s programme director at the US space agency’s Washington headquarters.

The telescope arrived in French Guiana in October after a 16-day sea journey from California through the Panama Canal to Port de Pariacabo on the Kourou River. After launch, it will deploy on a month-long 1.6-million kilometre journey to a more distant orbit than Hubble, beyond the moon.

“We’re going to look at everything there is in the universe that we can see. We want to know: how did we get here from the Big Bang, how did that work? So, we’ll look,” said John Mather, Webb senior project scientist at Nasa’s Goddard Space Flight Center in Greenbelt, Maryland.

Its mission goals include searching for the first galaxies or luminous objects formed after the Big Bang and learning how galaxies evolved from their initial birth to the present day.

The goals also include observing the formation of stars and the planets around them. Mather said Webb can peer into the clouds of gas and dust where stars are being born. Until now, the dust in those clouds obscured the view.

“Infrared light will go around the dust grains instead of bouncing off, so we can see that with the Webb telescope. And that's one of our top goals — to see how stars grow, with their young planets,” Mather said.

An instrument called a spectrometer can study the atmospheres of exoplanets. Mather said finding one with lots of water — thought to be one of the key ingredients for life — would be “really interesting.” As he put it: “A wet little planet out there that might be a little bit like home.”



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