Starman in Red Roadster A post shared by Elon Musk (@elonmusk) on Feb 4, 2018 at 9:50pm PST

SpaceX's pressure spacesuit will eventually be used by astronauts during trips to the International Space Station (ISS) aboard the Crew Dragon Capsule. They'll keep astronauts alive if there's a depressurization or other problem aboard the Dragon, but aren't meant for spacewalks. The launch aboard the Falcon Heavy figures to be the suit's first trip into space, but as with the Roadster, it's likely just for cosmetics and fun, not any serious testing.

The launch is already tricky, with Musk saying at one point that the odds of success were about 50/50. On Saturday, though, SpaceX amped up the degree of difficulty, confirming that it will attempt to land all three of the Falcon Heavy's booster rockets. Two will alight on land at the Kennedy Space Center, and the other will set down on SpaceX's Of Course I still Love You droneship in the Atlantic.