Could a Gravity Trick Speed Us to Mars? Wired

Putting a human on Mars might be easier than anyone thought. A flight to the Red Planet currently takes at least six months, which is why we send robots—the trip is boring, fuel costs are astronomical, and cosmic radiation is nobody’s friend. But NASA engineer Robert Adams has a solution: the two-burn maneuver, an all-but-forgotten secret of orbital mechanics that could cut travel time in half.