NASA

US space agency Nasa is puzzled by unexpectedly low levels of solar activity.

Russian scientists claim to have found new form of bacterial life in waters of 17 million-year-old Antarctic lake

Video footage of meteor that exploded into fireball over skies of Russia sparks fresh riddle for ufologists.

A report published by NASA claims there is a possibility a 270m asteroid will hit Earth in a little over 50 years time

Multi-millionaire Dennis Tito, who paid an estimated $20 million to be the first 'space tourist', plans to launch a manned mission to Mars.

Astronauts fielded questions from around the world in the first live Google+Hangout web chat with Nasa.

NASA is hosting a first-of-its-kind interactive session with astronauts aboard the International Space Station (ISS)

Remote update of computer software from Houston Mission Control crashes system and blacks out crew contact.

Prospective buyers post online ads offering £10,000 for rock fragments.

$2bn mission will send Clipper to explore the buried oceans of Europa

As the 2012 DA14 became the largest asteroid to pass within 17,200 miles of Earth, scientists have warned of the danger of future impacts.

Photographs of the impact of the Russian meteorite.

Nasa sees no connection between Russian meteorite and Asteroid that raced right past Earth.

Deputy PM Dmitry Rogozin urges nations to club together in absence of space debris interception technologies.

Earth gets another close encounter with flying space rock when asteroid 2012 da14 whizzes past our planet later - hours after a meteor burned up over the Urals in Russia.

An asteroid - 2012 DA14 - will come within 30,000km of Earth on the evening of 15 February. This is the closest that a Near Earth Object has ever been

Exploratory craft drills into Martian surface to and collect rock samples for Nasa scientists.

Object is largest to pass so close to our planet in 15 years, say Nasa scientists.

Impact of 2012 DA14 would be like 2.5 megatons of TNT, but NASA says: "relax"

Penn State Department of Geosciences scientists redraw band crucial for life to thrive.

Nasa transmits image of Mona Lisa to the Lunar Reconnaissance Orbiter.

2013 may be year mankind finally establishes contact with intelligent life from outside Earth.

Flying saucer 'triangle' captured on film few hundred miles above Earth by Nasa cameras and uploaded on YouTube.

Nasa satellite photograph shows scale of air pollution over country at never-before-seen levels.

Astronomers find first structure that forms part of the Milky Way's cosmic 'skeleton'.

Over-population, climate change, pollution, species extinction and over-consumption spell end of civilisation.

Quadrantids have maximum rate of up to 100 meteors per hour and expected to peak just before dawn on Friday.

Bunker 42 deep underground in Moscow to host end-of-the-world party for £600 a head.

Robotic telescope set up to offer live coverage of Mayan apocalypse.

The US government has issued guidelines on how to tell children about the forthcoming apocalypse.