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(Courtesy of NASA)

The Hubble Space Telescope’s Finest Photos

Now that the telescope has received its final upgrades, we look back on Hubble's most memorable images from space

The Hubble Constant - August and September 2005

Galaxy NGC 1309
(Courtesy of NASA)

This picture of the pinwheel-like galaxy NGC 1309 helped astronomers more accurately measure the universe’s rate of expansion, original discovered in 1929 by Edwin Hubble, the space telescope’s namesake. By measuring supernova explosions, scientists have been able to determine that this expansion is accelerating, because galaxies like NGC 1309 are moving away ever faster.

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