Liquid water has been observed on the planet Mars, the US space agency Nasa said on Monday.
"Mars
is not the dry, arid planet we thought of in the past," Jim Green,
Nasa's planetary science director, told a press conference.
"Under certain circumstances, liquid water has been found on Mars."
Scientists
have long believed that water once flowed freely across the
red planet
and was responsible for forming its valleys and canyons.
Major climate change about three billion years ago is believed to have changed all that, Green said.
"Today we're revolutionising our understanding of this planet," Green said.
"Our rovers are finding there's a lot more humidity in the air."
The rovers searching the planet's surface have also found that the soil is much more moist than anticipated.
Dark streaks running down slopes on the Martian surface were observed about four years ago.
Scientists
did not have proof, however, that these streaks - which would form in
spring, grow by summer and then disappear by autumn - were actually
water.
But after careful study and analysis, they are ready to say that these streaks are, in fact, water.
Monday, September 28, 2015
Evidence of flowing liquid water on Mars: Nasa
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