The Earth once had two moons circling in the same orbit, say scientists, until a collision between the two created the moon we see today.
An international team of astronomers has discovered 96 star clusters hidden by dust in the Milky Way galaxy.
SpaceX CEO Elon Musk believes the human race should aspire to colonize the solar system, rather than just making do with inhabiting planet Earth.
NASA's Dawn probe is beginning the first of four science orbits, and has sent back its first close-up images.
Oxygen molecules have been detected for the first ever time in space, helping explain where some of the universe's missing oxygen may be hiding.
NASA may have retired its shuttles, but SpaceX has confirmed plans to launch a second test capsule to the International Space Station (ISS) on November 30th.
So let me understand this. First, we spend billions of dollars building the International Space Station (ISS). Then Moscow decides it will unceremoniously fly the ISS into the Pacific Ocean.
It's two and a half thousand years since the Greek philosopher Philolaus suggested the existence of a 'counter-Earth' - another planet sharing Earth's orbit.
First NASA launched its final shuttle mission earlier this month, and now Russia is debating how to do away with the International Space Station (ISS) as it nears the end of its life cycle.
An Australian PhD student has produced one of the most accurate measurements ever made of how fast the universe is expanding and thus how big it is.
ESA’s Herschel space observatory has solved the 14-year mystery of where the water in Saturn's upper atmosphere comes from - it's being expelled from the planet's moon Enceladus.
Scientists have found a volcanic 'hot spot' on the far side of the moon, indicating that the moon's been more geologically active, more recently, than previously believed.
NASA's picked the site for the next Mars rover landing - a spot inside the planet's Gale crater that the scientists say just might reveal whether the planet could have supported life.
Astronomers have found an enormous cloud of water - containing 140 trillion times as much as is found on Earth - floating around a distant quasar.
Aurorae on many planets could make our own Northern and Southern lights look like a flickering candle, new research has shown.
The last ever space shuttle flight ended safely early this morning, bringing to an end a thirty-year career that included the delivery of the Hubble Space Telescope and the building of the International Space Station.
Quite by accident, astronomers using the Hubble Space Telescope have discovered a fourth moon orbiting the (dwarf) planet Pluto.
The Russian RadioAstron space telescope - effectively, the biggest ever - has been successfully launched from Baikonur in Kazakhstan.
As the last Shuttle astronauts return to Earth, NASA is starting to put in place its plans for commercially-operated replacements. It's signed a deal with the United Launch Alliance (ULA) to evaluate its Atlas 5 rocket for use in human missions.
Around half the 44 trillion watts of heat that flows from the interior of the Earth is the remaining heat from the planet's creation.