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killian killian
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10 years ago
One of the most fundamental discoveries about the Universe has been that it is expanding. "The universe is expanding" means
A) our estimate for the size of the universe has increased over the last century.
B) galaxies are growing with time.
C) the cosmological horizon is growing with time.
D) distances between most galaxies are getting larger.
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padrepadre
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10 years ago
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killian Author
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10 years ago
Thanks for helping me with my astronomy class
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