Topic: John Grunsfeld

NASA is repurposing an old spy telescope to build a telescope 100 times more powerful than the Hubble Space Telescope, to launch sometime in the 2020s.

NASA was forced to postpone the Insight mission indefinitely after leaks were discovered in one of the lander's instruments.

On Friday, NASA released the clearest close-ups of Pluto yet. The high-resolution images were captured by the New Horizons probe during this summer's flyby.

Venus and asteroids are the most likely candidates on NASA's shortlist for the next scientific mission. After selecting targets, a launch is possible in 2020.

NASA's high-powered camera attached to NOAA's Deep Space Climate Observatory (DSCOVR) satellite has returned its first photo of a sun-lit Earth.

The New Horizons space probe came within 7,800 miles of Pluto, providing NASA with the clearest photographs it's ever seen of the dwarf planet.

Twenty-five years ago today, April 24, 1990, NASA's Hubble Space Telescope -- the world's preeminent orbital observatory -- was launched into low Earth orbit.

NASA's Cassini probe has evidence of hydrothermal activity on Saturn's moon Enceladus -- the first confirmation of hydrothermal activity beyond planet Earth.

For the first time, data collected by NASA's GPM Earth-observing satellite has been used to build a comprehensive map of Earth's precipitation.

At a panel discussion on the search for alien life, held this week at NASA's headquarters in Washington, the agency's top scientists said they're getting close.