![]() ![]() Type 1 allows a time traveler to journey along a CTC through space and time and into the past and, when there, interfere with their past self. (Image credit: Shutterstock) (opens in new tab) Philosophers, scientists and fiction writers have dreamt up multiple versions of time, where it may have more dimensions and features than we understand. CTCs come in two primary types, unimaginatively titled Type 1 and Type 2. The idea that space and time were no longer static stages on which the events of the universe simply play out earned general relativity the alternative name "the geometric theory of gravity."įrom general relativity, mathematician Kurt Gödel formulated the idea of closed timelike curves (CTCs) (opens in new tab), paths through space-time that return to their starting point without violating special relativity. Traveling faster than light, these massless particles - which Feinberg dubbed " tachyons" in a 1967 paper - would travel backward through time, thus introducing the concept of time travel to physics that went way beyond idle speculation.Įinstein would take this idea further with general relativity, the idea that space-time itself can be shaped by mass and energy and that gravity is a result of this influence. But scientists following Einstein's work, including Columbia University physicist Gerald Feinberg, suggested the existence of hypothetical particles that could be caught speeding. So no particle with mass could accelerate to the speed of light, as this would take an infinite amount of energy.
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