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What is space-time?

A:

Quick Answer

Space-time is a mathematical and physical construct that explains how space and time interact; the three physical dimensions and one time dimension combine to create the four-dimensional nature of the universe. Space-time resulted from Albert Einstein's work on relativity.

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Full Answer

Relativity states that objects moving through space at different speeds experience time differently, and experiments have provided support for this notion. This poses problems for high-speed space transportation, as people on a spacecraft traveling near the speed of light would experience time far more slowly than people on Earth. This time difference is measurable, even within a planet-sized space. The time kept on GPS satellites, for example, drifts when compared to clocks on Earth, and they need to be adjusted regularly.

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