That the Earth and all the other planets rotate around the Sun... and not around the Earth........
they belive that the earth was flat.
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he thought that the universe and the solar system was the same thing but know we now that they are to separate things
people who study about the universe are called astronomers
Astronomers and physicists.
Islamic astronomers contributed to the edestruction of the geocentric view of the universe a iSlmamlhdiI.
Perhaps in the future astronomers will do all the redshifts of the 100 billion galaxies in the universe.
Astronomers use an auditory up on a hillside, and away from cities and pollution. So what i'm trying to say is that astronomers use an auditory to study the components of the universe.
Cosmologists.
Cosmologists
It tells us that the Universe is expanding.
It is possible that someday astronomers will measure all the distances of the 100 billion galaxies in the universe.