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Dhaka Tribune

Nasa finds evidence of liquid water on Mars

Update : 28 Sep 2015, 06:39 PM

Liquid water has been observed on the planet Mars, the US space agency Nasa said 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 fall -- were actually water.

But after careful study and analysis, they are ready to say that these streaks are, in fact, water.

Nasa’s ongoing Mars rover Curiosity has found evidence that Mars had all the ingredients and suitable habitats for microbial life to exist at some point in its past.

Scientists have been trying to figure out how it transformed from a warm, wet and likely Earth-like planet early in its history into the cold, dry desert that exists today.

Billions of years ago, Mars, which lacks a protective, global magnetic field, lost much of its atmosphere. Several initiatives are under way to determine how much of the planet’s water was stripped away and how much remains locked in ice in underground reservoirs. 

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