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ASTRONOMERS DO NOT KNOW HOW MANY GALAXIES THERE AR...
ASTRONOMERS DO NOT KNOW HOW MANY GALAXIES THERE ARE, BUT IT IS TH...
LUYEN THI TOIEC 870 CAU TRAC NGHIEM
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857. Astronomers do not know how many galaxies there are, but it is thought that there is millions or A B C Dperhaps billions.
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857.
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LUYEN THI TOIEC 870 CAU TRAC NGHIEM