Mars rover Curiosity sees key water indicator
US: The US space agency (Nasa) has reported that its Curiosity rover
has made another significant discovery on Mars. The robot has drilled
into a rock that contains clay minerals - an indication of formation in,
or substantial alteration by, neutral water.
Scientists say the find is one more step towards showing conditions
on the Red Planet in the distant past could have supported life.
Many rocks studied previously were probably deposited in acidic
water. While this would not have precluded the possibility of
micro-organisms taking hold on Mars, it would have been more
challenging, scientists believe.
Identifying clays shows there were at least some locations on the
planet billions of years ago where environments would have been much
more favourable.
Curiosity made the assessment after studying a powdered sample
drilled from a fine-grained rock at its exploration site in Gale Crater,
a deep impact bowl on Mars' equator.
It found the rock sample to be 20-30 per cent smectite - a particular
class of clay minerals. Scientists say the rock may have formed in a
lake.
The rover has already seen plenty of evidence for past running water
in Gale. Last year, it identified the remains of an ancient riverbed
system where water once flowed, perhaps a metre deep.
BBC NEWS
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