| http://www.w3.org/ns/prov#value | - From Einstein's equations of general relativity, which can be used to deduce the curvature of a given universe's space-time from its shape and other properties, we know there are plenty of hypothetical universes in which time travel would ...To continue reading this article, subscribe to receive access to all of newscientist.com, including 20 years of archive content.
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