Live coverage: NASA confirms successful first flight of Mars helicopter

NASA has directed Boeing and SpaceX to halt activities under contracts awarded last month to build commercial space taxis to ferry astronauts to the Space Station while the U.S. Government Accountability Office reviews a protest of NASA’s decision filed by Sierra Nevada.

The ISS Deorbit Vehicle, or DV, will be a custom-built, one-of-a-kind spacecraft needed to make sure the space station re-enters the atmosphere at the precise place and in the proper orientation to insure any wreckage that survives the 3,000-degree heat of re-entry will crash harmlessly into the sea.

Follow the key events of the Falcon 9 rocket’s ascent to orbit with five more Iridium Next communications satellite and the U.S.-German GRACE-Follow On climate research mission.