By Dr David Whitehouse
Is there life beneath the soil?
Methane has been found in the Martian atmosphere which scientists say could be a sign that life exists today on Mars.
It was detected by telescopes on Earth and has recently been confirmed by instruments onboard the European Space Agency's orbiting Mars Express craft. Methane lives for a short time in the Martian atmosphere so it must be being constantly replenished. Scientists see two possibilities, both of them scientifically important, but one of them is sensational: either active volcanoes, none of which have been found yet on Mars, or microbes - meaning life on Mars.
Read full article at the BBC News site.
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