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If Earth has a moon, I wonder if the other planets do as well?
Imagine what we could see in the universe if the telescope was clearer!
The General Theory of Relativity
Galileo Galilei first invented the telescope in 1609. He then used it to discover Jupiter's four largest moons.
In 1668, Sir Isaac Newton improved the telescope using reflective concave mirrors. Now the telescope was clearer and could be used for longer distances.
Albert Einstein then drafted the General Theory of Relativity in 1905.
In 1929, Edwin Hubble demonstrated that the universe is expanding .
Galileo Galileis space probe discovers the origin of Jupiter's rings in 1998.
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