Longtime NASA astronaut Don Pettit is set to return from his fourth trip to space on Saturday night. Here are some of his most stunning photos of the cosmos.

This illustration shows an exoplanet orbiting around two brown dwarfs –– objects bigger than gas-giant planets but too small to be proper stars. ESO/M. Kornmesser Astronomers have discovered a ...

Photographer extraordinaire Don Pettit is about to return to Earth following a seven-month stay aboard the International Space Station (ISS). During his time in orbit some 250 miles above Earth ...

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