Shuttle Atlantis astronauts awoke on Sunday to Keith Urban’s “Days Go By.”

“The days do go by, so we better start living and we are,” so said Atlantis mission specialist Rex Walheim, who followed a taped video message from employees at NASA's Johnson Space Center.  

The current space shuttle mission is NASA’s final in the program. Atlantis is scheduled to return to Earth about 5 a.m. Thursday (July 21.)