New measurements of Mars ' atmosphere are not promising for current life on that planet . Comment: Its atmosphere was stripped away by sun , bombardment . Mars Curiosity rover found that life could have existed on Mars in the distant past .
New measurements of Mars ' atmosphere are not promising for current life on that planet . Mars formed about 4.5 billion years ago . Its atmosphere was stripped away by sun , bombardment . Mars Curiosity rover found that life could have existed on Mars in the distant past .