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The Bernardinelli-Bernstein comet, identified in 2021, is officially the biggest comet ever observed. The new record, reported on the preprint website arXiv and now accepted for publication in the journal Astronomy and Astrophysics Letters, bumps the Hale-Bopp comet from the top spot. Hale-Bopp was discovered in 1995 and became visible to the naked eye in 1996; it … Read more
After several tense days of unfurling and clicking its various parts into place, the biggest and most sophisticated space telescope ever launched is now complete. On 8 January, NASA’s James Webb Space Telescope slowly swung the last 3 of its 18 hexagonal mirror segments into position, locking them together into one 6.5-metre-wide, gold-coated cosmic eye. … Read more
NASA’s newest flagship observatory is about to begin an incredible journey and now has an official launch date. The James Webb Space Telescope is expected to launch in a week, on Dec. 24 at 7:20 a.m. EST (1220 GMT or 9:20 a.m. local time in French Guiana), and has been packed up inside the nose … Read more