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Swan Leavitt (Henrietta)

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Swan Leavitt (Henrietta)

 

Henrietta Swan Leavitt was a Harvard astronomer who, in 1908, discovered how to calculate how far away stars are from the earth. Comparing a star's true brightness to its apparent brightness seen through a telescope.

 

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Exploringnature.org has more than 2,000 illustrated animals. Read about them, color them, label them, learn to draw them.