For decades, scientists have had better maps of the Moon and Mars than of Earth’s own ocean floor. But thanks to NASA’s Surface Water and Ocean Topography (SWOT) satellite, a groundbreaking new space-based map of the seafloor is changing that.

After a week-long trip to the International Space Station ballooned into a nine-month stay, NASA astronauts Barry (Butch) Wilmore and Suni Williams are finally home.