Four years ago, the Smithsonian's National Air and Space Museum swapped out NASA space shuttles, trading the orbiter Enterprise for its sister ship Discovery. Now "Star Trek," the inspiration for the earlier shuttle's name, has done the same.
Elon Musk's private spaceflight company, SpaceX, is another step closer to making its Falcon 9 rockets fully reusable. The company announced yesterday the first test firing of a Falcon 9 rocket engine that had already been launched and landed.
A Falcon 9 first stage, which has already flown a mission for the private spaceflight company, was run through a full duration test firing on July 28, 2016. The test occurred at SpaceX's rocket development facility in Texas.