The legendary Hubble Space Telescope is facing a silent crisis as orbital decay pulls it closer to a fiery end in Earth's atmosphere. The Dog Star: By NASA, H.E. Bond and E. Nelan (Space Telescope ...
In our galaxy, a supernova explodes about once or twice each century. But historical astronomical records show that the last Milky Way core-collapse supernova seen by humans was about 1,000 years ago.
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