We might be days away from witnessing SpaceX make history. The private space corporation has conducted a static test fire (yet again) of the first rocket it landed on an ocean platform. SpaceX wants to make sure it's in tip-top shape for lift off, because it has finally decided on a date after almost a year of putting it off: March 30th. Jeff Bezos' Blue Origin already sent a used rocket back to space in early 2016. But if the launch on Thursday is successful, it'll be the first orbital mission ever to fly with a used rocket.