NASA

To prepare for life in zero gravity, astronauts make sure their arms and hands are in tip-top shape.

More than 850 articles have been uploaded so far, and more are on the way.

Not good things, to our dismay.

Then President Nixon chatted with the astronauts while they were in a quarantine capsule.

Four out of every five astronauts on long-term missions return to Earth with a condition called visual impairment intracranial pressure syndrome.

From an engineering standpoint, Juno's July 4 arrival at Jupiter is fitting, as the endeavor is a sort of declaration of independence from the required use of nuclear power in missions to outer planets.

After a five-year journey, Juno will be ensnared by Jupiter's gravity and orbit the planet 33 times, then plunge beneath the clouds and disintegrate.

The recovery was unbelievably lucky.

These "human computers" were an integral part of the early space program, but were largely unheralded.

The Opportunity Rover turned to see the vortex forming in the valley below.

We may release the (submarine into) Kraken, a liquid hydrocarbon sea on Titan, sometime in the 2040s. How cool is that?

“This is a body different than any we’ve examined thus far.”