Remarkable claim forces Nasa to deny existence of extraterrestrial life for second time this month
Video was made in 2008 on the International Space Station - but without permission
Of course, if the space agency is wrong, a planet-sized spaceship is heading straight for us
You couldn't live on Kepler-20e or Kepler-20f, but their discovery is still important
Earth-like microbes could survive in large parts of the Red Planet, according to study
New planet could harbour liquid water but scientist casts doubt on whether it is habitable
After nine months and a journey of 422 million miles, Nasa's Phoenix probe touched down in the arctic region of Mars
Above: 'X-43', Barbara Prey, 2005
On Monday, seven Nasa astronauts embarked on an 11-day mission to mend the Hubble Space Telescope
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