what was one of the great discoveries in astronomy during the 20th century?
Posted in Q-A
from the breakthroughs in astronomy the 20th century was that A) there to become existence on Mars. B) in the biggest scale, galaxies are at random distributed in space. C) our star, the sun's rays, is outdoors from the Milky Way. D) our universe is alone among another galaxies it's not of the cluster of [...]
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