Video: Alice Bowman, New Horizons mission operations manager, previews Ultima Thule flyby (members only)

Astronauts Doug Hurley and Bob Behnken donned their SpaceX-made launch and entry flight suits Saturday and rode to pad 39A at the Kennedy Space Center in a final dress rehearsal before launch day.

The work isn’t over for NASA’s Ingenuity Mars helicopter. Engineers hope to fly the rotorcraft four more times in the next two weeks before calling it quits on the pioneering technology experiment, which accomplished the first powered flight of an aircraft on another planet Monday.

After a year-long delay to troubleshoot recurring erroneous data signatures from the rudder of Northrop Grumman’s air-launched Pegasus XL rocket, NASA is eager to send a $252 million research satellite into orbit as soon as Thursday night off Florida’s east coast on a mission to probe the ionosphere, a region near the boundary between Earth’s atmosphere and space.