Around 90 years ago, a Belgian astronomer named Georges Lemaîtreproposed that observed changes in theshifting of light from distant galaxies implied the Universe is expanding.
Now maybe those future astronomers will have records handed down from an earlier era, like ours,attesting to an expanding cosmos teeming with galaxies.
The fact that the universe had a beginning is underscored by evidence such as the second law of thermodynamics, the radiation echo of the big bang discovered in the early 1900s,the fact that the universe is expanding and can be traced back to a singular beginning, and Einstein's theory of relativity.
宇宙が膨張していないとしたらどうして銀河が離れていくのか?
As the universe expands, why don't galaxies get stretched out?
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