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Astronomy and Cosmology
Astronomy and Astrophysics
How on Earth This is possible? (distance to a far galaxy)
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[QUOTE="Bandersnatch, post: 6018195, member: 399360"] Let's say the light is emitted at a distance D from the observer. In a non-expanding universe, that initial distance would remain constant in time, and it'd take t=D/c to cover the distance. In an expanding universe, as the light travels, the distance D grows - both in the part that the light still has to cover, and the part already covered. This means that the time needed to reach the observer is higher than t=D/c, and the distance at which the source galaxy ends up being by the time of reception is higher than the initial distance D. [SIZE=2] edit: typo[/SIZE] [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
How on Earth This is possible? (distance to a far galaxy)
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