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[[Image:lighterstill.jpg]]
[[Image:lighterstill.jpg]]
[[Image:Unionsphere2.jpg|left|"Unionsphere"]]
[[Image:Unionsphere2.jpg|left|frame]]
The '''Universe''' is defined as the summation of all particles and energy that exist and the [[space-time]] in which all events occur. Based on observations of the portion of the universe that is [[observable universe|observable]], physicists attempt to describe the whole of space-time, including all [[matter]] and [[energy]] and events which occur, as a single system corresponding to a mathematical model.
The '''Universe''' is defined as the summation of all particles and energy that exist and the [[space-time]] in which all events occur. Based on observations of the portion of the universe that is [[observable universe|observable]], physicists attempt to describe the whole of space-time, including all [[matter]] and [[energy]] and events which occur, as a single system corresponding to a mathematical model.
