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@physics-trail: How do we know

RE: RE: How do we know that the universe is expanding?

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RE: How do we know that the universe is expanding?

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RE: How do we know that the universe is expanding?

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Saturday, August 12, 2017 8:43 AM

How do we know that the planets are red-shifted and not just red coloured, like red giants?

Saturday, August 12, 2017 8:43 AM

physics-trail(52)

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