Most missions to Mars rely on parachutes that slow down spacecraft from Mach 30 as they enter the Martian atmosphere. But since parachutes aren't effective for heavy, crewed spacecraft, a human mission to Mars will require an whole new landing approach that uses retrorockets to slow down.

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Most missions to Mars rely on parachutes that slow down spacecraft from Mach 30 as they enter the Martian atmosphere. But since parachutes aren't effective for heavy, crewed spacecraft, a human mission to Mars will require an whole new landing approach that uses retrorockets to slow down.