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Recipe for Rocket-Free Space Travel: Dive In and Paddle, Patiently

Science  28 Feb 2003:
Vol. 299, Issue 5611, pp. 1295
DOI: 10.1126/science.299.5611.1295a

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A physicist has figured out a way to propel a spacecraft without expelling anything in the opposite direction. The discovery, published online this week by Science (, won't lead to a practical propulsion system, but gravitational physicists are nonetheless excited about the notion of swimming in spacetime.