Hopefully we’ll know in the coming days what problems can be fixed to prevent this type of instability in the future. But one thing is certain: SpaceX is making progress. With their first rocket-landing attempt, the rocket ran out of hydraulic fluid needed to power its hypersonic grid fins, which help to slow down and steer the vehicle to its ultimate destination. The result? The first stage slammed into the drone spaceport at a mostly horizontal angle.