A GIGANTIC space contraption is gearing up to scan alien atmospheres and peer back to the dawn of time.

The James Webb Space Telescope is due to launch next year and will be the most powerful telescope ever built.

Put together by Nasa and aerospace company Northrop Grumman, the $10billion (7.6billion) machine has been plagued by delays and setbacks.

However, it appears it's finally on track to head into space in 2021, giving scientists the chance to "look into the past", according to its creators.

"Over the last few years, we were working in two halves," Northrop Grumman's Scott Willoughby told reporters last month, according to Fast Company.

"Until the summer of last year, they were in a very long engagement, and they got married," he joked.

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"We put the two halves together to create an observatory. Were celebrating that success."

The project has taken 24 years to complete with the help of thousands of scientists and engineers.

These experts come from 24 countries across three space agencies Nasa, the Canadian Space Agency and the European Space Agency.

Orbiting nearly 1million miles from Earth and measuring four storeys high, the James Webb Space Telescope (JWST) will scan light from stars and galaxies.

It can peer 13.7billion light-years (that's about eight with 22 zeroes afterwards in miles) through space because it's orbiting extremely far from Earth.

For most space telescopes, Earth's thick atmosphere obscures readings but the JWST won't have that problem.

One of the probe's goals is to find new planets outside of the Solar System and scan their atmospheres for signs of aliens.

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Specifically, it will look for oxygen on alien worlds, one of the key ingredients for life as we know it.

The JWST will also "look back in time" by scanning light given off by extremely distant galaxies and stars.

This ability to "time travel" is based on the fact that even light has a speed limit.

The further you peer into space, the more time has passed since the light you are looking at set off on its journey towards you.

So if a star explodes 6billion light-years away, the light from the event will take 6billion years to reach Earth effectively allowing us to see through time.

Professor Alistair Glasse, of the UK Astronomy Technology Centre, said: "Light takes a finite team to reach us because it doesn't reach our eyes instantly.

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"The further away an object is, the longer that light has been travelling before we detect it.

"With the telescope we can look as far away as the edge of the visible universe.

"The age of the universe is about 13.5billion years and we can say light has been travelling that long before it reaches us."

JWST is three times larger than its predecessor the Hubble telescope and 100 times more powerful thanks to its vast gold-plated mirror.

The massive primary mirror, stretching 21ft across, is made up of 18 hexagons each the size of a coffee table and weighing 46 lbs.

The beryllium components are coated with a fine film of vaporised gold to bounce infrared light into the sensor equipment.

Unmatched infrared sensitivity will help astronomers understand how galaxies assemble over billions of years.

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In other news, a Nasa photo last week revealed a mysterious hole in Mars that according to scientists may house alien life.

A supersonic 990mph Nasa X-planeas quiet as the "thump of a car door"is nearly ready.

And, Nasa recently revealeda surreal photo of Earthtaken from 4billion miles away.

What do you think the James Webb Telescope will find? Let us know in the comments!

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Mind-blowing Nasa James Webb Space telescope will look 13.5billion years BACK in time - The Sun