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Galaxies Grow By Snacking

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Galaxies Grow By Snacking

Evidence from observations and computer simulations supports a picture of galaxy growth that isn't dominated by the rough-and-tumble crashes of big galaxies.

To make a giant cookie, you would probably start by grabbing two clumps of cookie dough and smooshing them together. Astronomers long thought the same went for galaxies: want to build a big galaxy? Merge two galaxies together. Voilà.

But astronomers are finding that major mergers aren’t the fundamental galaxy builders they once seemed.

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