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Today, scientists no longer think in terms of a 'universe' as everything that exists. Our knowledge of the world we live in has progressed enormously as each new discovery reveals another fascinating truth. We used to think that Earth was at the center of everything that exists. We used to think that the stars in the night sky were somehow "stuck" on a celestial sphere. Even one hundred years ago, we thought that the Milky Way Galaxy was 'the universe'. Today, what we are accustomed to thinking of as 'the universe' composed of 100 billion galaxies racing away from each other at light speed may not be all of reality. Our universe may be one of many other universes in an even larger realm. This new totality is dubbed 'the multiverse'. Each universe in this multiverse may be likened to a 'brane' or 'bubble'. These separate universes are labeled by physicists and philosophers as 'parallel universes' or 'parallel worlds'. You can see how our knowledge of the world has progressed from 'other planets' to 'other stars' to 'other galaxies' and now to 'other universes'. And so far, the only other world we earthbound humans have personally visited is the Moon.

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13y ago

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