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SpaceX has finally landed its Falcon 9 rocket on a drone ship at sea, after launching the vehicle into space yesterday. This is the first time the company has been able to pull off an ocean landing, after four previous attempts ended in failure. This success is a crucial milestone for SpaceX as it shows the company can land its rockets both on solid ground and ocean. But it is also a milestone for a future of more cost efficient private space travel enabling rocket reusability.