NASA’s Curiosity rover will land on Mars on Wednesday night, landing in the Gale Crater, the first step in what NASA hopes will be an ambitious mission to the Red Planet.

NASA’s rover Curiosity, the centerpiece of NASA’s $2.5 billion Mars 2020 rover mission, will land in the crater on Mars’s Gale Craters east side.

NASA has not said when it will take the rover back to the agency’s headquarters on Wallops Island, Virginia, or where it will land.

Here’s a timeline of what to expect.