Nasa announces alien life could be thriving on Saturn’s moon Enceladus. It might look like a frozen wasteland, but beneath the inhospitable surface of Saturn’s moon Enceladus, life could be thriving in warm underground seas, scientists believe. Nasa’s Cassini spacecraft has picked up the first evidence that chemical reactions are happening deep below the ice which could be creating an environment capable of supporting microbes. Experts said the discovery was ‘the last piece’ in the puzzle which proved that life was possible on Enceladus, a finding all the more remarkable because the small moon is 887 million miles away from the Sun.

Prof David Rothery, Professor of Planetary Geosciences, The Open University, said: “At present, we know of only one genesis of life, the one that led to us.

“If we knew that life had started independently in two places in our Solar System, then we could be pretty confident that life also got started on some of the tens of billions of planets and moons around other stars in our galaxy.”

Liquid oceans exist miles below the surface on Enceladus, so to find out what is happening in the underground seas scientists must rely on the plumes of spray which shoot up into the atmosphere through cracks in the ice.

In October 2015 Nasa sent Cassini into a deep dive through one of those plumes and discovered hydrogen and carbon dioxide.

In a report of their findings published today in the journal Science, scientists said that the ‘only plausible’ source for the hydrogen was chemical reactions between warm water and rocks on the ocean floor.

Crucially, if hydrogen is present it can mix with carbon dioxide to form methane, which is consumed by microbes in the deep, dark seas of our own planet.

“Saturn’s moon Enceladus has an ice-covered ocean, and a plume of material erupts from cracks in the ice,” said Professor Hunter Waite, of Southwest Research Institute (SwRI) in San Antonio, Principal Investigator for Cassini’s Mass Spectrometer instrument which detected the hydrogen.

“The plume contains chemical signatures of water-rock interaction between the ocean and a rocky core. We find that the most plausible source of this hydrogen is ongoing hydrothermal reactions of rock containing reduced minerals and organic materials.

“On the modern Earth, geochemically derived fuels such as hydrogen support thriving ecosystems even in the absence of sunlight.”

Enceladus is the sixth largest moon of Saturn, and was discovered in 1789 by the British astronomer William Herschel. It is around 310 miles in diameter and approximately 790 million miles from Earth.

Scientists had long suspected that liquid water could exist on the moon because of the extreme tidal forces acting on the satellite from Saturn’s gravity.

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