The month-long launch window for NASA’s new Mars lander, InSight opens this weekend. InSight will be the first spacecraft to use a robotic arm to place its instruments on another planet’s soil—effectively unraveling the innards of the Red Planet. It’s also the first interplanetary mission to launch from the West Coast instead of Cape Canaveral, and it may not be the last. InSight isn’t a rover, like Curiosity or Opportunity, but a stationary lander.

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