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The moon's interior may harbor 100 times more water than previous estimates, according to a new study that took a fresh look at samples of moon rocks collected by Apollo astronauts nearly 40 years ago.

A vast ocean likely covered one-third of the surface of Mars some 3.5 billion years ago, according to a new study. While the notion of a large, ancient ocean on Mars has been repeatedly proposed and challenged over the past two decades, the research provides further support for the idea of a sustained sea on the Red Planet more than 3 billion years ...

A team of scientists flew to the Australian Outback on Monday and recovered a Japanese space capsule that they hope contains asteroid samples providing clues into the evolution of the solar system.

Saturn's largest moon, Titan possesses an ammonia and methane atmosphere that obscures its frozen surface from view. Since a 1980 Voyager I flyby, ...

An international team of researchers on Thursday launched a grueling simulation of a flight to Mars that will keep them locked in a cascade of ...

Space shuttle Atlantis zoomed toward its final touchdown Wednesday to cap a 25-year flying career, bringing back six astronauts who boosted ...

"We'll start by sending astronauts to an asteroid for the first time in history," President Obama said in an April speech at NASA's Kennedy Space ...

Scientists don't know quite why, but one of Jupiter's two main cloud belts has disappeared -- again.

Japan's space agency is launching a mission to Venus to study its weather and hunt for signs of lightning and volcanoes.

Space shuttle Atlantis thundered off its launchpad at Kennedy Space Center into cloudless skies Friday afternoon and headed to the International Space Station on the 32nd and final planned mission of its 25-year career.