NASA astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko spent most of a year on the International Space Station. Their landing brings an epic mission to an end.
During his 340 days aboard the International Space Station, the astronaut documented his time there with hundreds of photos. Kelly says the perspective makes him feel like an environmentalist.
During his 340 days aboard the International Space Station, the astronaut documented his time there with hundreds of photos. Kelly says the perspective makes him feel like an environmentalist.
Professor Kim Binsted at the University of Hawaii At Manoa is the head of a series of NASA-funded projects trying to understand how a humans would survive on Mars.
Early Air Force experiments helped pave the way for the space program. Joseph Kittinger, who jumped from a balloon 103,000 feet up, talks about his experience.
Astronomers have known about the powerful pulses but had never been able to catch one in the act to help figure out what's producing them. Last year, they got one.
Scientists were studying the properties of the light coming from a quasar — one of the brightest objects in the universe — when the light just seemed to wink out. Now they think they know why.
When NASA asked who wanted to be an astronaut, thousands of people said yes. The agency received a record number of applicants for the next class of astronaut candidates.
With all the excitement over the discovery of gravitational waves, NPR's Linda Wertheimer takes a moment to remember the man who first imagined a universe we couldn't yet see: Albert Einstein.