A NASA research plane has landed without its landing gear in Texas, sending plumes of flame behind it. The incident occurred Tuesday, with the plane's belly sliding across the runway. NASA said all crew members were safe after the landed recorded on video. It attributed the incident to a mechanical issue and said the cause will be investigated. The aircraft is the NASA WB-57, a research plane with a distinct thin fuselage that was designed in the 1970s. The plane can fly at high altitudes, beyond 63,000 feet, for several hours.
