Lacking the proper laser tools, shuttle Discovery's astronauts performed a cursory wing inspection Sunday as they zoomed ever closer to the international space station. Space Shuttle Discovery lifts off from pad 39A at the Kennedy Space Center, Fla. Saturday, May 31, 2008. Space Shuttle Discovery with seven crew members are on a 14 day mission to the International Space Station. The space shuttle Discovery lifts off Saturday May 31, 2008 at the Kennedy Space Center in Cape Canaveral, Fla. Space Shuttle Discovery lifts off from pad 39A at the Kennedy Space Center, Cape Canaveral, Fla. Saturday, May 31, 2008. Erika Beauchamp and her children McKenna, 6, left, Natalie, 1, in her arms, and Hannah, 4, watch the launch of the Space Shuttle Discovery from Jetty Park in Cape Canaveral, Fla., Saturday, May 31, 2008. Discovery and a crew of seven astronauts lifted off on a 13-day mission to the International Space Station. The space shuttle Discovery heads for orbit during liftoff Saturday May 31, 2008 at the Kennedy Space Center in Cape Canaveral, Fla. The space shuttle Discovery lifts off at Kennedy Space Center in Cape Canaveral, Fla. Saturday, May 31, 2008. Discovery and a crew of seven astronauts are on a 13-day mission to the International Space Station. The space shuttle Discovery thunders off the launch pad while lifting off Saturday May 31, 2008 at the Kennedy Space Center in Cape Canaveral, Fla. The Space Shuttle Discovery lifts off from launch pad 39a at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, May 31, 2008.