Hanging in orbit just 3,700 miles above the surface of Mars, the planet's closest moon, Phobos, seems to be undergoing a "structural failure," NASA says.
The International Space Station conducted a spacewalk this week to mark 15 years in space. Three people who've walked in space share their miraculous — and miserable — experiences.
Three spacefarers heading to the International Space Station this week had to take a detour in order to avoid space debris. Researchers have yet to solve the problem of orbiting junk.
The photos come from a camera on a satellite, once called "GoreSat" after former Vice President Al Gore, who initially proposed the project in the late 1990s.
When a probe skimmed past the dwarf planet in July, researchers expected to see a cold, dead world. New results published today show that Pluto is an active place.
But, using images from the Hubble Space Telescope, scientists have learned the great storm is putting up a fight because it is now shrinking at a slower rate.
Scientists have long wondered what's in the wispy cloud of gas floating in the space between the stars, absorbing starlight. Turns out it's a form of carbon named after architect Buckminster Fuller.
Pluto's atmosphere has a blue haze, in a new photo from the New Horizons probe. But the particles causing that color are probably gray or red — and the planet's surface has red ice.