It's a shock: Life on Earth may have come from out of this world

A group of international scientists including a Lawrence Livermore National Laboratory researcher have confirmed that life really could have come from out of this world.

Mysterious Centaurs may be comets

The true identity of centaurs, the small celestial bodies orbiting the sun between Jupiter and Neptune, is one of the enduring mysteries of astrophysics. Are they asteroids or comets? A new study of observations from NASA's Wide-field Infrared Survey Explorer (WISE) finds most centaurs are comets.

Comets form 'breeding ground' for complex organics

The evidence is piling up that the building blocks of life could have been brought to Earth by comets, after emerging in the dust of interplanetary space.

Icy organics help understanding of origin of life

NASA scientists are zapping organics with lasers in an attempt to discover how life arose on Earth.

Trillions of comets collide around Fomalhaut

A ring of dust around the nearby star Fomalhaut is created by the collision of thousands of comets every day.

Planet-forming disk could create thousands of oceans

Astronomers have discovered an embryonic solar system surrounded by a cloud of water vapor that could eventually form comets and deliver oceans to dry worlds.

New moon map sheds light on Earth's early history

The moon was blitzed by two different sets of asteroids or comets in its youth, according to new results from NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft.

Best-known comets may be visitors from other stars

Many of the most famous comets in history, including Halley, Hale-Bopp and McNaught, may have come to our solar system from elsewhere.