○○○Copernicus's theory⪢⪢
When Galileo announced that he believed in Copernicus's theory that the earth revolved around the sun, some officials of the Roman Catholic church were angry.
#possessive
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○○○Galileo⪢⪢
_____ was famous for demonstrating that light and heavy objects fall at exactly the same speed unless an object is so light that it is slowed by the air.
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○○○Ptholemy⪢⪢
The old idea that the sun moved around the earth is known as the geocentric theory.
This idea was first made famous by an ancient Greek scientist Ptolomy who lived in Egypt nearly 2000 years ago.
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