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Tonight's Sky

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Win 5 playful planetary pals that are out of this world.

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Second planet found around Proxima Centauri

Located just 4.2 light-years away, the Sun's nearest neighbor now has both an Earth-like world (Proxima b) and a more distant super-Earth (Proxima c).

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Dark, dusty skies.

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Historic Yerkes Observatory plans to reopen

The Yerkes Future Foundation aims to restore, refurbish, and reopen the storied building.

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Moon Village:

Humanity's first step toward a lunar colony?

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Where did Earth's water come from?

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Disappearing Moon

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Ball of suns

Globular cluster M15 in the constellation Pegasus the Winged Horse is a showpiece object in the fall sky. Astronomers estimate its age at 12 billion years. It lies 33,000 light-years away.