3 Great Mysteries About Life on Mars

Our trips to Mars have opened a window into the deep past of the red planet, when conditions were far more conducive to life. This summer, NASA will launch its latest rover, Perseverance, on a seventh-month journey to Mars. Like its predecessor, Curiosity, Perseverance will touch down in the remains of an ancient Martian lake bed. What it finds there — along with missions launched by China and the United Arab Emirates — could help us Earthlings understand what Mars was like as a young planet some 4 billion years ago, and whether life ever blossomed on its surface.

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