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A thick layer of dust from the impact may have served as "cosmetic fillers."
The 1.27 billion-year-old rock bridges a huge gap in the Red Planet's history.
The Red Planet may have once been habitable, with a thicker atmosphere and surface liquid water.
Astronomers found evidence that solar storms and dust storms magnify heat synergistically on Mars, by as much as 90 degrees Fahrenheit (50 degrees Celsius).
The rover has never found so many in one place before.
