Four astronauts were all smiles Tuesday evening when they splashed down off the Florida coast on a SpaceX Dragon capsule. See photos.

Butch Wilmore and Suni Williams will finally get their first breath of fresh Earth air after their roughly nine-day test flight stretched into a controversial monthslong journey.

Everything from walking, to wearing clothes, to smelling food and other odors terra firma will require getting used to for Williams and Wilmore, 59 and 62, experts say.