Fifty years after President Kennedy’s call to put a man on the moon, the space agency is at a crossroads.

NASA must look beyond the earthly demands of deficit cutting and politics to chart its course.

At least five Earth-sized planets appear to be orbiting their stars at just the right distance to host water.

A total solar eclipse that darkened much of Asia on July 22 was the 21st century’s longest and gave scientists and sky-watchers an observational bonanza

Merging galaxies that forcefully eject supermassive black holes have theoretically created a class of “rogue” objects—and now scientists think they know how to find them.

After five successful spacewalks that have left the Hubble Space Telescope more capable than ever, astronauts on the space shuttle Atlantis hold a space-based press conference.

Finding the source of a faint “shh” sound could help scientists better predict space weather, which can bombard satellites, spacecraft, and spacewalking astronauts with dangerous radiation.

The same process that drives auroras on Earth is ten times more intense on tiny Mercury, where it creates invisible whirlwinds of particles, data from a NASA craft have revealed.

A giant space blob discovered in the far reaches of the universe has scientists puzzling over what exactly the bizarre object might be, according to a new study.
At 12.9 billion light-years away, the blob—dubbed Himiko after a legendary Japanese queen—is the fourth most distant object ever discovered, said lead study author Masami Ouchi, a Carnegie [...]

The fifth and final trip by shuttle astronauts to the Hubble Space Telescope will leave the historic satellite more capable than it has ever been, senior NASA officials said this week.
A shuttle mission scheduled for mid-October is set to deliver new components and undertake extensive in-space repairs—a first—on broken instruments attached to the orbiting [...]