NASA Jet Propulsion Laboratory

When NASA’s Curiosity Rover reaches Mars this August, it’ll takes seven minutes to get from the tip of the atmosphere to the surface of the planet. Those seven minutes are a little scary for engineers who’ve sunk a lot of time into this project, so the descent is called the “seven minutes of terror.” Here it gets highlighted by an awesome, super-dramatic video.

Curiosity will go from 13,000 mph to zero in those seven minutes, and even worse, scientists have to sit at home base and wait it out; it takes 14 minutes to receive a signal, so if Curiosity is totaled, they won’t know about it until seven minutes later.