>Amazing enough they can do that on land - doing it on the ocean like that is just incredible as it's basically a moving target they're trying to land on. Ok I'm impressed!
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http://www.theverge.com/2016/4/8/11392138/spacex-landing-success-falcon-9-rocket-barge-at-seaThe article explains why, for several reasons it's actually easier trying to land on the drone barge than to fly it back to its launch point. And it's pretty much required for launches that use a lot of fuel (so there's not much left to manoeuvre the rocket).
As for moving target, have you seen video of the other landings/attempts? It comes in so fast there's not much time for the barge to move. Z-axis might be the hardest to deal with but I imagine they don't launch unless weather conditions at the barge are reasonable (no huge swells).
Regards. Al
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