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https://www.sciencetimes.com/articles/6531/20150522/reasons-why-some-scientists-believe-there-is-life-on-mars.htm
While Mars is no Earth, many scientists believe that there could still could be life on the surface of the Red Planet just waiting for us to discover, despite the differences between the two planets.
https://www.answers.com/Q/Why_do_scientists_believe_mars_is_unable_to_support_life
Nov 28, 2009 · Scientists still hope that Mars may have life of some kind; it would be an exciting discovery! Some reasons why Mars is unable to form EARTH life forms would be the lack of an oxygen atmosphere and the lack of water except possibly as ice in the polar regions.
https://www.nasa.gov/audience/forstudents/postsecondary/features/mars_life_feature_1015.html
It doesn't seem like there is life now on Mars. But maybe there is life that could live in an extreme environment like on Mars...or maybe Mars was different in the past. This is what we'll look at now. On Earth, we know that there are many kinds of life which can live in difficult environments.
https://www.quora.com/Why-do-some-scientists-considered-that-Mars-can-support-life
Mars does have an atmosphere all be it very thin. Scientists believe that Mars could support life if that life were to live under ground, in deep under ground caves etc. Being under ground would allow life to exist because that life wouldn't be sterilised/neutralised by the sun's rays.
https://www.nytimes.com/2013/03/13/science/space/mars-could-have-supported-life-nasa-says.html
Mar 13, 2013 · Mars Could Have Supported Life Long Ago, NASA Says. Two images of the surface of Mars from the Opportunity rover, left, and the Curiosity rover. Scientists are studying Martian rocks for evidence of past life.
https://mars.jpl.nasa.gov/msp98/why.html
Mars and Water Mars today is too cold, with an atmosphere that is too thin, to support liquid water on its surface. Yet scientists who studied images from the Viking orbiters kept encountering features that appeared to be formed by flowing water - among them deep channels and canyons,...
https://spaceplace.nasa.gov/review/dr-marc-solar-system/life-on-mars.html
We have learned that even though Mars is more similar to Earth than anywhere else in the solar system, and therefore is a good place to look for life, it is still different from Earth in many ways. A compass points to the north pole on Earth because our whole planet acts like a giant magnet, but Mars does not act this way.
https://www.space.com/17135-life-on-mars.html
But Mars wasn't always a desolate wasteland. Scientists think that, in the past, water may have flowed across the surface in rivers and streams, and that vast oceans covered the planet. Over time, the water was lost into space, but early conditions on the wetter planet could have been right for life to evolve.
https://www.smithsonianmag.com/science-nature/life-on-mars-78138144/
Still, scientists are confident they can develop tools to distinguish between imported Earth microbes and Martian ones. Finding signs of life on Mars is by no means the only goal.
http://astronomy.com/news/2017/05/could-we-live-on-mars
The atmosphere of Mars is mostly carbon dioxide, the surface of the planet is too cold to sustain human life, and the planet’s gravity is a mere 38% of Earth’s. Plus, the atmosphere on Mars is equivalent to about 1% of the Earth’s atmosphere at sea level. That makes getting to the surface tricky.
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