How big is the universe?


Quick Answer

As of 2013, the National Aeronautics and Space Administration determined, with a margin of error of only 0.4 percent, that the universe is infinite in size. The observable universe extends 92 billion light years in diameter. The exact size of the universe, or if there are multiples, is unknown.

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Full Answer

Shape and expansion determine the size of the universe. A finite universe should be spherically-shaped, causing an eventual collapse by a critical amount of density and gravity. The universe, however, is constantly expanding at an accelerated rate, implying a force stronger than gravity. As of 2013, NASA has proven that the universe is flat. This discovery denotes a universe that is infinite in size. Due to the finite age of the universe, however, astronomers can only see the observable universe.

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