Technicians had failed to fix the leak by 20 December, and Nasa decided there wasn't time to solve the problem before the scheduled March 2016 launch date
'Mark Watney's journey to Mars in the film mimics the real challenges of going to the Red Planet'
There won't be another full moon on Christmas Day until 2034
Rock formations on the surface of Mars similar to those on Earth could have been formed by frozen carbon dioxide, not running water
A passion for exploration, a love of science and a lack of vertigo is what Nasa needs in its astronauts
British astronaut Tim Peake has set off on his historic flight to the International Space Station today.
As Tim Peake becomes the first Briton in space for two decades, here's what happens to the body during long-term space flight
The Cassini probe's infrared camera manage to penetrate the moon's hazy atmosphere
The pictures have travelled slowly through 5.2 billion km from the probe to Earth
As he runs on the treadmill his speed will be tracked and a virtual reality app on his iPad will show the streets of London, as if he were running the marathon on Earth
As dizzying as it is beautiful
He inspired generations of aerospace engineers and was one of the few who have flown the Gossamer Condor human-powered aircraft, demonstrating an impressive power-to-weight ratio.
The Voyager probes are carrying two records that contain images and messages of peace from Earth
Nasa astronaut Kjell Lindgren played Amazing Grace to become the first person to ever play the bagpipes in space
The next round of Nasa's astronaut program is opening soon – just how much do you know about the selection process?
The astronaut played the song to honour colleague Victor Hurst, a research scientist who died suddenly