NASA's Hubble Space Telescope mapped 200 million stars in Andromeda, revealing that the galaxy's star formation has steadily declined over the past 500 million years. The Andromeda galaxy, our Milky Way’s nearest big neighbor, gives astronomers a close-up view of another galaxy. Using NASA’s Hubble Space Telescope, scientists mapped two-thirds of Andromeda’s disk in sharp detail, measuring about 200 million stars.... [3550 chars]
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