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Has there ever been life elsewhere in our solar system? Could it be there today?

Could life have ever found a foothold in any niche on another planet such as Mars, or on the moons of the giant gaseous outer planets? JPL is studying high-priority future missions that would characterize Jupiter’s moon Europa to assess its potentially life-friendly environments, and could potentially return samples from Mars to close in on whether that planet is habitable and could have ever hosted life.