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The heavens were studied by ancient astronomers.

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CCSS.L.8.1D

CCSS.L.8.3A

CCSS.L.8.1B

CCSS.L.2.1F

A solar eclipse was predicted by Thales of Miletus in 585 B.C. 

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CCSS.L.8.1C

CCSS.L.8.3A

Hipparchus established an observatory in the third century B.C.

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CCSS.L.8.1C

CCSS.L.8.3A

A supernova, or exploding star, was recorded by Chinese astronomers in 1054. 

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CCSS.L.8.1B

CCSS.L.8.1D

CCSS.L.8.3A

CCSS.L.2.1F

In 1543, a new theory was suggested by a Polish astronomer, Copernicus. 

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CCSS.L.8.1B

CCSS.L.8.1D

CCSS.L.8.3A

CCSS.L.2.1F

In this theory, Earth and other planets orbited the sun.

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CCSS.L.8.1C

CCSS.L.8.3A

The use of Copernicus's theory was forbidden by religious leaders until 1757. 

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CCSS.L.8.1C

However, persons  were convinced  about Copernicus's theory  by the discoveries of other astronomers.

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CCSS.L.8.1C

CCSS.L.8.3A

The law of universal gravitation was discovered by Sir Isaac Newton.

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CCSS.L.8.1C

CCSS.L.8.3A

The Copernican theory gained support after this discovery.

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CCSS.RI.8.3