A study of water from the Martian interior shows that Mars was originally formed from similar building blocks to Earth, but evolved differently later on.
Three astronauts have returned safely to Earth after 127 days in space on the International Space Station.
A recent image snapped by NASA's Hubble Space Telescope illustrates numerous luminous galaxies glowing just like fireflies on a dark night.
In support of their views, climate change skeptics have long pointed to the fact that Antarctic sea ice - unlike that in the Arctic - is actually growing.
NASA's Hubble Space Telescope recently captured an impressive view of the center of globular cluster NGC 6362.
The ESO’s La Silla Observatory in Chile recently captured a colorful view of the globular star cluster NGC 6362.
The nearby star Fomalhaut does host a massive exoplanet after all, say NASA scientists following a second look at Hubble data.
NASA's Cassini spacecraft has been watching the aftermath of the largest and hottest stratospheric vortex ever detected in our solar system.
The hole in the ozone layer over the Antarctic was the second smallest in the last two decades, data from NASA and the National Oceanic and Atmospheric Administration (NOAA) satellites shows.
NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) has taken its first look at the giant black hole at the center of our galaxy - and caught it right in the middle of a flare-up.
NASA scientists have discovered an unexpected pattern of change in hundreds of galaxies observed by the Keck and Hubble space telescopes.
NASA astronomers describe NGC 3344 as a "glorious" spiral galaxy around half the size of the Milky Way, which lies some 25 million light-years distant.
NASA's Mars rover Curiosity has chomped up its first solid sample, taking it into its Chemistry and Mineralogy (CheMin) instrument for analysis.
NASA’s Voyager probe swept past Uranus in 1986, but yielded few new details of the planet and its atmosphere.
NASA's New Horizons spacecraft - now just two years away from Pluto - is on a riskier mission than previously realized, thanks to the threat posed bty the planet's moons and possible rings.
A robotic exoskeleton developed as a spin-off from NASA's Robonaut 2 project could help astronauts stay healthier in space, and paraplegics walk.
The first rock to be touched by NASA's Curiosity rover - dubbed Jake Matijevic - turns out to have a very Earth-like composition, different to anything before seen on Mars.
NASA's Mars Curiosity rover has successfully collected and sampled a scoopful of sand and powdery material at the "Rocknest" site on the Red Planet.
NASA's Swift satellite recently detected a rising tide of high-energy X-rays from a source toward the center of our Milky Way galaxy.
NASA's Curiosity rover is getting ready to take its first scoop of Martian soil.