With a final course-correcting maneuver by on-board rocket thrusters, NASA's James Webb Space Telescope reached its destination at a position of orbital stability between the Earth and sun known as Lagrange Point Two, or L2, arriving one month after launch, the space agency said on its website.
The thrusters were activated by mission control engineers at the Space Telescope Science Institute in Baltimore, and the ground team used radio signals to confirm that Webb was successfully "inserted" into an orbital loop around L2. The combined pull of the sun and Earth at L2 will hold the telescope firmly in place so it takes little additional rocket thrust to keep Webb from drifting, Eric Smith, NASA's program scientist for Webb, told Reuters in an interview last week.
These features are expected to usher in a revolution in astronomy, giving a first view of infant galaxies dating to just 100 million years after the Big Bang, the theoretical flashpoint that set the expansion of the known universe in motion an estimated 13.8 billion years ago. The 18 segments now need to be aligned to achieve the mirror's proper focus, a process that will take three months to complete.
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