Hubble
2 个月前
At the heart of our Milky Way galaxy is a supermassive black hole. 

About 3.5 million years ago, it unleashed a burst of energy that our very distant hominid ancestors likely saw as ghostly light overhead. Hubble is uncovering clues about this explosion: https://t.co/kSEB8wdbwH https://t.co/WQg7cKuu2B

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