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EntertainmentBillions of alien civilizations have existed
Scientists calculate and almost certainly many extraterrestrial civilizations have existed in this universe.Prove that humans are not alone in the universe by mathematics
Mathematicians who have just answered the eternal question of mankind are: Are we human beings alone in the universe?
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Xinjiang - The Unincorporated Area in China
How many days on Earth is one day on the Moon?
Hubble telescope captures image of 'bridge' connecting two galaxies
Why is interstellar travel impossible today?
When cattle in a herd are attacked, why don't the others help?
In ancient times, there was no market in the palace, so where did the concubines spend their monthly money?
Ancient Diaries Reveal the Construction of the Great Pyramid of Giza
Discovery of mysterious dwarf planet beyond Neptune stuns astronomers
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