New research raises hopes of finding alien life on Jupiter's icy moon Europa
Scientists believe life may exist within underground ocean - living off minerals and using tidal heat as a source of energy
Steve Connor is the Science Editor of The Independent. He has won many awards for his journalism, including five-times winner of the prestigious British science writers’ award; the David Perlman Award of the American Geophysical Union; twice commended as specialist journalist of the year in the UK Press Awards; UK health journalist of the year and a special merit award of the European School of Oncology for his investigative journalism. He has a degree in zoology from the University of Oxford and has a special interest in genetics and medical science, human evolution and origins, climate change and the environment.
Thursday 12 December 2013
One of the moons of Jupiter may be another habitable part of the Solar System according to new research showing that Europa is rich in vital minerals and has spectacular water fountains spraying from a subsurface ocean.
The Hubble Space Telescope has identified two huge plumes of water as high as 200km (124 miles) which occasionally erupt on Europa, while a separate study has found clay-like minerals littered around the moon’s frozen surface.
The water fountain appears at certain moments in the orbit of Europa around Jupiter, suggesting it is powered by immense tidal forces that periodically increase the pressure within a subsurface ocean, causing it to erupt through cracks in the surface ice, according an analysis of Hubble data published in the journal Science.
Europa is one of the more significant of Jupiter’s 63 known moons and astronomers believe that below is ice-covered surface is an ocean kept liquid by the heat of tidal forces. Some scientists have suggested that life may exist within this ocean, living off minerals and using tidal heat as a source of energy.
A separate study based on a new analysis of data from Nasa Galileo mission detected important clay-like minerals on the surface of Europa which could have come from past collisions with asteroids or comets.
Jim Shirley of Nasa’s Jet Propulsion Laboratory in Pasadena, California, said: “Organic materials, which are important building blocks for life, are often found in comets and primitive asteroids. Finding the rocky residues of this comet crash on Europa’s surface may open up a new chapter in the story of the search for life on Europa.”
Many scientists believe that Europa may be the best place in the Solar System to find existing life as its ocean is in contact with rock and the icy surface is mixing with the ocean below, creating an energy gradient and a source of heat as the moon get progressively stretched and squeezed by gravity during its orbit around Jupiter.
[Image courtesy of K. Retherford, Southwest Research Institute]
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