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It looks like the concept of presidential candidates taking swipes at each other on Twitter has caught on, and it’s moved over to the private spaceflight industry. The rocket motor that Elon Musk hopes will power missions to Mars was test-fired last Sunday at their facility in McGregor, Texas. Musk posted images of the test firing on Twitter, as well as some of the specifics for the engine. The Raptor engine was first introduced four years ago, and is intended to be a multi-stage engine that could eventually boost people and material to Mars. It is also planned to be reusable to reduce the cost of those missions. Two national aviation associations