From Paul Sutherland on Scientific American:
Final proof that Mars has bred life will be confirmed this year, leading NASA experts believe. The historic discovery will come not on Mars itself but from chunks of the red planet here on Earth.
David McKay, chief of astrobiology at NASA’s Johnson Space Centre in Houston, says powerful new microscopes and other instruments will establish whether features in martian meteorites are alien fossils.
He says evidence for life in the space rocks could have been claimed by the UK if British scientists had used readily-available electron microscopes. Instead, images of colonies of martian bacteria were collected by American scientists.
The NASA team is already convinced that colonies of micro-organisms are visible inside three martian rocks that landed on Earth. If so, this would have profound implications for our understanding of life in the universe.
Two of the meteorites – ALH84001 and Yamato 593 – were found in the Antarctic by American and Japanese scientists after they lay in the icy desert for thousands of years.
But of special interest is a meteorite that fell in many chunks at Nakhla, Egypt, in 1911. Most of the fragments ended up in London’s Natural History Museum.
The stones are known to be from Mars because gases trapped inside them match those in rocks examined by probes on the red planet. They were blasted out of its surface by asteroid impacts and then drifted around the solar system for millions of years before falling to earth…
[continues on Scientific American]
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