James Webb Space Telescope, the world's biggest and most powerful space telescope, arrives at its gravitational parking spot in orbit around the Sun, almost 1.5 million km away from the Earth, says NASA.

The telescope will enable astronomers to peer back further in time than ever before, all the way back to when the first stars and galaxies were forming 13.7 billion years ago.
The telescope will enable astronomers to peer back further in time than ever before, all the way back to when the first stars and galaxies were forming 13.7 billion years ago. (AP)

The world’s biggest, most powerful space telescope has arrived at its observation post 1 million miles from Earth, a month after it lifted off on a quest to behold the dawn of the universe.

On command, the James Webb Space Telescope fired its rocket thrusters for nearly five minutes to go into orbit around the Sun at its designated location, and NASA confirmed on Monday the operation went as planned. 

The mirrors on the $10 billion observatory still must be meticulously aligned and the infrared detectors sufficiently chilled before science observations can begin in June. But flight controllers in Baltimore were euphoric after chalking up another success.

"We're one step closer to uncovering the mysteries of the universe. And I can't wait to see Webb's first new views of the universe this summer!" NASA Administrator Bill Nelson said in a statement.

Monday's thruster firing put the telescope into orbit around the Sun at the so-called second Lagrange point, where the gravitational forces of the Sun and Earth balance. 

READ MORE: NASA's Webb telescope successfully deploys tennis-court-sized sunshield

High-flying drama

The telescope will enable astronomers to peer back further in time than ever before, all the way back to when the first stars and galaxies were forming 13.7 billion years ago. That's a mere 100 million years from the Big Bang when scientists say the universe was created.

Besides making stellar observations, Webb will scan the atmospheres of alien worlds for possible signs of life.

The high-flying drama began within days of liftoff.

A Sun shield as big as a tennis court stretched open on the telescope in early January, 1 1/2 weeks after the Christmas Day launch from French Guiana. The observatory's gold-coated mirror — 21 feet across — unfolded a few days later.

At 1.6 million kilometres away, Webb is more than four times as distant as the Moon.

"Wow, what a ride this last month it's been,” said Amber Straughn, a deputy project scientist for NASA.

READ MORE: World's most powerful telescope blasts off into space

Emergency repairs

Considered the successor to the Hubble Space Telescope, which orbits 530 kilometres up, Webb is too far away for emergency repairs. That makes the milestones over the past month — and the ones ahead — all the more critical.

Spacewalking astronauts performed surgery five times on Hubble. The first operation, in 1993, corrected the telescope's blurry vision, a flaw introduced during the mirror's construction on the ground.

Whether chasing optical and ultralight light like Hubble or infrared light like Webb, telescopes can see farther and more clearly when operating above Earth's distorting atmosphere. That's why NASA teamed up with the European and Canadian space agencies to get Webb and its massive mirror — the largest ever launched — out into the cosmos.

READ MORE: Move over Hubble, the James Webb Space Telescope is here

Source: AP