Has Nasa created an engine to take us to the stars? the answer is maybe. According to Geek.com, Nasa has successfully created an EmDrive, which seemingly defies the law of conservation of momentum by creating thrust out of nothing. There is disagreement in the scientific community as to why exactly the engine works and no one fully understands it yet. The drive may prove that large chunks of Einsteinian physics might be totally wrong. What is clear is that NASA's physicists has yet another challenge ahead of them.