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Between 13 and 20 billion years ago the big bang probably happend.
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The first astronamers were early humans in about 35,000 B.C. They made bone carvings to keep track of the moon
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In 2,000 B.C. the first calendars were made by ancient Egyptians and Mesopotamians.
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Aristotle was born in 384-322 B.C. In 350 B.C. Aristotle found a number of proofs that th Earth is a sphere such as when we have a solar eclipse the shadow is always a circle.
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A.D.
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Gallileo discovers that when somthing is in motion it stays in motion unless somthing stops it. Gallileo was born in 1564 and he died in 1642.
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In 1600 william gilbert proposes that the Earth has a diphole magnetic field. He was born in 1544 and he died in 1603.
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In 1667 he discovers the universal laws of gavitation. He was born in 1643 and he died in 1727.
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In 1781 William Hershal discovers Uranus. William Hershel was born in 1738 and he died in 1822.
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Pierre Simon Laplace discovers that collapsed stars can produce black holes in 1790. Pierre Simon Laplace was born in 1749 and he died in 1827.
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In 1846 calculations from Leverrier showed that Neptune.
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In 1918 Harlow Shapley Found the size and shape of the Milky way. He also found how far we are from the milkyway. He was born in 1885 and he died in 1972.
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In 1929 Edward Hubble discovers that the universe is expanding. He was born in 1889 and he died in 1953.
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In 1969 Niel Armstrong and Buzz Aldrin landed on the moon. They were the first ones to stand there. They were both born in 1930.
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In 1987 a super nova was spotted. It was the first one seen qith out a telescope in 400 years
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The Hubble space telescope was launched in 1990. It showed gerat images of our universe
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In 1995 other planets were found orbiting other stars.
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in 280 B.C. Aristarchus suggests that the Earth revolves around the sun. He was born in 310 B.C and he died in 230 B.C.
