Sound Asleep: NASA's Mars rover Spirit, seen here in an artist's rendering, has been hibernating through the the cold and dark Martian winter, and mission scientists aren't sure when its solar panels will have charged the batteries enough for it to wake up. NASA hide caption

itoggle caption NASA

Ring It In: A trip toward Saturn is just one of many space missions scientists might choose to pursue in the coming years. Some researchers want to send a nuclear-powered boat to the methane lakes on one of Saturn's moons, Titan. Cassini Imaging Team/JPL/NASA hide caption

itoggle caption Cassini Imaging Team/JPL/NASA

SOFIA made its first in-flight observations in May. Take a look at the pictures here. Courtesy of NASA hide caption

itoggle caption Courtesy of NASA