Once-stranded astronauts hours away from splashdown. Catch up on the saga so far

After a week-long trip to the International Space Station ballooned into a nine-month stay, two stranded NASA astronauts are finally heading home. On Tuesday, if all goes to plan, a capsule will splash down off the Florida coast shortly before 6 p.m. ET, bringing Barry "Butch" Wilmore and Suni Williams back to the Earth’s surface for the first time since they launched into space last June.