NASA X-ray spacecraft discovers supernova wreckage at the heart of the Milky Way
NASA's Chandra X-ray spacecraft has detected the supernova wreckage of a dead star that erupted 1,700 years ago and ejected debris at 2 million miles per hour.
NASA exoplanet-hunting spacecraft TESS reveals its most complete look at the night sky yet
TESS 发布了最完整的地球天空视图，揭示了太阳系之外 6,000 个潜在世界的位置。
