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When you see the Andromeda Galaxy, you are seeing light that left it about 2.5 million years ago.

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The spiral Andromeda Galaxy glowing against a dark star field
Space

2.5M yrs

When you see the Andromeda Galaxy, you are seeing light that left it about 2.5 million years ago.

Yes. The Andromeda Galaxy lies about 2.5 million light years away, so its light has travelled for about 2.5 million years to reach us. It is the farthest object most people can see without a telescope.

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