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Telescope
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Spiral Galaxy NGC 4414: knowing the distance, which happens to be 60 million light-years from Earth, contributes to astronomers' overall knowledge of the universe's rate of expansion and its age.

Hubble, a View to the Edge of Space looks at the people, tools, ideas, and places of the Hubble Space Telescope. See how...
Galileo appears before the Inquisition, circa 1632, in a 19th-century painting by Joseph-Nicolas Robert-Fleury.

Galileo's Battle for the Heavens explains why Galileo is the father of modern science, why Galileo's refractor and...
  

National Science Foundation

National Science Foundation
   
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