Saturday, May 18, 2024

Enormous Webb telescope unfurls ‘golden eye’

NASA’s new space telescope opened its huge, gold-plated, flower-shaped mirror Saturday, the final step in the observatory’s dramatic unfurling, reports Phys.org. The last portion of the 6.5-metre mirror swung into place at flight controllers’ command, completing the unfolding of the James Webb Space Telescope. “I’m emotional about it,” said Thomas Zurbuchen, chief of NASA’s science missions. “What an amazing milestone. We see that beautiful pattern out there in the sky now.” More powerful than the Hubble Space Telescope, the $10-billion Webb will scan the cosmos for light streaming from the first stars and galaxies formed 13.7 billion years ago. To accomplish this, NASA had to outfit Webb with the largest and most sensitive mirror ever launched – its “golden eye”, as scientists call it. Webb is so big that it had to be folded origami-style to fit in the rocket that soared from South America two weeks ago. The riskiest operation occurred earlier in the week, when the tennis court-size sunshield unfurled, providing subzero shade for the mirror and infrared detectors. Flight controllers in Baltimore began opening the primary mirror Friday, unfolding the left side like a drop-leaf table. The mood was even more upbeat Saturday, with peppy music filling the control room as the right side snapped into place. After applauding, the controllers immediately got back to work, latching everything down. They jumped to their feet, exchanged high-fives and cheered from behind masks when the operation was complete 2.5 hours later. Webb’s main mirror is made of beryllium, a lightweight yet sturdy and cold-resistant metal. Each of its 18 segments is coated with an ultra-thin layer of gold, highly reflective of infrared light. The hexagonal, coffee-table-size segments must be adjusted in the weeks ahead so they can focus as one on stars, galaxies, and alien worlds that might hold atmospheric signs of life. “It’s like we have 18 mirrors that are right now little prima donnas all doing their own thing, singing their own tune in whatever key they’re in, and we have to make them work like a chorus and that is a methodical, laborious process,” operations project scientist Jane Rigby said. Webb should reach its destination 1.6 million kilometres away in two weeks; it’s already more than 667,000 1 million kilometres from Earth since its Christmas Day launch. If all continues to go well, science observations will begin this summer. Astronomers hope to peer back to within 100 million years of the universe-forming Big Bang, closer than Hubble has achieved.

 

https://phys.org/news/2022-01-space-telescope-golden-eye-major.html

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