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首页星系壁纸 Galaxies Grow from Inside Out

Galaxies Grow from Inside Out

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by NASA/JPL-Caltech

NASA Image Library · 公有领域（Public Domain）

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Evidence from NASA Wide-field Infrared Survey Explorer and Galaxy Evolution Explorer missions provide support for the inside-out theory of galaxy evolution, which holds that star formation starts at the core of the galaxy and spreads outward.

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