Bean was the lunar module pilot of Apollo 12, which made the second moon landing, in 1969. Later in life, as a painter, he chronicled the people and experience of the Apollo program.
The two satellites, which are collectively called GRACE and will replace two retired probes, are one of the most important tools for understanding the effects of climate change.
First spotted in 2010, a space rock is zooming toward Earth, making a close pass on Tuesday that will see it fly safely by — about halfway between our planet and the moon.
In 2015, to great fanfare, NASA announced a planet discovery considered a milestone in the hunt for another Earth. But now some researchers say it's not clear that this planet actually exists.
NASA is launching a probe to explore the center of Mars. NPR's Lulu Garcia-Navarro talks with Oliver Morton, author of Mapping Mars, about what scientists hope to learn.
The InSight Mars lander was successfully launched on Saturday morning, by an Atlas V rocket taking off from Vandenberg Air Force Base in California. It will gather data on Mars' interior.
The NASA mission is set to launch Saturday morning. The InSight spacecraft will land in the Elysium Planitia to listen for "Marsquakes" and learn more about what Mars is made of.