Submit your question and, if it is selected, CNN will find an expert to provide an answer. The answers will appear on CNN and this Web site. The Global Hawk followed a pre-programmed route, and landed in Australia on schedule.
Military planners see great potential for reconnaissance flights.
USAF press release Shuttle Update on the current shuttle mission and its installation of the robotic arm on the International Space Station. A very well preserved fossil found in China is apparently from a small dinosaur that had feathers. That's adding to the debate over how closely dinosaurs are related to modern birds. Florida's manatees are a federally protected species, but many of the big, gentle mammals still turn up with injuries caused by boat propellers or fishing lines. That's the subject of an ongoing debate.