Moontanman Posted July 27, 2009 Report Posted July 27, 2009 Surprises from General Relativity: "Swimming" in Spacetime In Albert Einstein’s theory of general relativity, gravity arises from spacetime being curved. Today, 90 years after Einstein developed the theory’s equations, physicists are still uncovering new surprises in them. For example, in a curved space, a body can seemingly defy basic physics and “swim” through a vacuum without needing to push on anything or be pushed by anything. Curved spacetime also allows a kind of gliding, in which a body can slow its fall even in a vacuum. Surprises from General Relativity: "Swimming" in Spacetime: Scientific American Quote
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