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[Music]

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we now realize that our own milky way

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has in the past merged with other

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galaxies and will be merging with our

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neighbor spiral the andromeda galaxy in

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a few billion years hubble has discerned

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that we're on a head-on collision

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but it shouldn't be too disruptive to

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what hubble has revealed is that the

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universe has in fact changed over these

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billions of years of time the early

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galaxies the very distant ones as we see

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them are simple

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sometimes they're messy looking they're

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small

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they haven't had time yet to form that

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grand spiral structure

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[Music]

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over time we see galaxies actually

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merging with other galaxies and growing

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bigger and bigger and those mergers by

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the way can look like train wrecks in

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our hubble images this is something that