A universe, also known as the cosmos, is all matter, energy and space regarded as a whole. The laws of the universe are governed by time. Our space-time continuum is filled with clusters of stars known as galaxies which are grouped by gravity.

All the matter of our universe originated from the parallel Megan universe through creation points. Creation points were the active portals between the two dimensional planes. In the Megan universe, magic, the ability to control reality with thoughts, was part of the natural laws. (TAS: "The Magicks of Megas-Tu")
Big BangThe Big Bang

The universe was formed in the instantaneous expansion that scientists call the Big Bang. The Big Bang has been theorized to be caused by destabilizing Omega molecules. (VOY: "Death Wish", "The Omega Directive") According to an engineer on board the USS Voyager, the universe was sixteen billion years old. (VOY: "Good Shepherd")
Current real-world scientific evidence however indicates the age of the universe to be 13.798 ± 0.037 billion years.

According to Jack, our universe will collapse in on itself some time between the next sixty to seventy trillion years. The universe contains too much matter to keep expanding. According to Jack, a massive spherical grid of subspace field generators could be used to manipulate subspace to reduce the mass of the universe and change the cosmological constant. This would avert the collapse. (DS9: "Chrysalis")

Our universe contained several parallel time continuums occupying the same space but in a different time. (TNG: "Time's Arrow", "Timescape") The Devidian, for example, lived in a different time continuum, only a fraction of a second away, with a positive phase variance of 0.004 percent from the normal timeline. (TNG: "Time's Arrow", "Time's Arrow, Part II")

Our universe is only one of several types of parallel universes. A new universe can be shaped by a person's thoughts while inside a warp bubble. While Dr. Crusher was caught in a shrinking warp bubble and asked the computer for the definition of the universe, it replied: "The universe is a spheroid region seven hundred and five meters in diameter." A scan of the edge of that universe revealed it to be a mass energy field. (TNG: "Remember Me")
USS Enterprise in distant galaxy, remasteredThe USS Enterprise-D at a distant region of the universe

In 2364, the Traveller accidentally took the USS Enterprise-D to a location over a billion light years from the Milky Way Galaxy, where thoughts were the essence of reality. It was believed that the place was the outer rim of the universe, where the universe ends. (TNG: "Where No One Has Gone Before")
The Universe is commonly defined as the totality of existence,[1][2][3][4] including planets, stars, galaxies, the contents of intergalactic space, and all matter and energy.[5][6] Similar terms include the cosmos, the world and nature.

The farthest distance that it is theoretically possible for humans to see, called the observable universe, is about 93 billion light years in diameter.[7] Scientific observation of the Universe has led to inferences of its earlier stages. These observations suggest that the Universe has been governed by the same physical laws and constants throughout most of its extent and history. The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe, which is calculated to have begun 13.798 ± 0.037 billion years ago.[8][9] Observations have shown that the Universe appears to be expanding at an accelerating rate.

There are many competing theories about the ultimate fate of the Universe. Physicists remain unsure about what, if anything, preceded the Big Bang. Many refuse to speculate, doubting that any information from any such prior state could ever be accessible. There are various multiverse hypotheses, in which physicists have suggested that the Universe might be one among many universes that likewise exist.[10][11]

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