By studying the emissions from the centers of certain galaxies, scientists can achieve a more precise understanding of how fast the universe is expanding.
https://www.space.com/38056-megamasers-universe-expansion-hubble-photo.html
By studying the emissions from the centers of certain galaxies, scientists can achieve a more precise understanding of how fast the universe is expanding.
https://www.space.com/38056-megamasers-universe-expansion-hubble-photo.html
We should explore some under water world too.
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