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It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.

It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.

It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.

It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.

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15y ago

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