Astronauts flying on a space shuttle mission to service the Hubble Space Telescope for a final time will speak to middle school students across America simultaneously at 1:15 p.m. EDT, April 30, from NASA's Goddard Space Flight Center in Greenbelt, Md.

Through NASA's Digital Learning Network (DLN), students at five middle schools and an invited student audience at Goddard will talk to the shuttle crew. Topics of discussion will include details about the upcoming STS-125 mission to service Hubble. Astronauts also will discuss career diversity among the crew. Each has a doctorate degree in a science, technology, engineering and mathematics discipline.