Some scientists believe Mars could be habitable right now-- by microbes, true, but still life beyond Earth.
They point to evidence that briny water may still flow on Mars on a seasonal basis, creating possible oases for life. They also compare Mars to some of the most inhospitable places on Earth and note life survives there, sometimes using strategies that could also work on Mars. Plus, some argue the chemical composition of Martian soil may in fact have blocked the tests for life performed by the Viking landers of the 1970s, leading scientists, potentially, down the wrong path.
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