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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, 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 generally accepted [[scientific theory]] which describes the origin and evolution of the universe is [[Big Bang]] [[physical cosmology|cosmology]], which describes the [[expansion of space]] from an extremely hot and dense state of unknown characteristics. The universe underwent a rapid period of [[cosmic inflation]] that flattened out nearly all initial irregularities in the energy density; thereafter the universe expanded and became steadily cooler and less dense. Minor variations in the distribution of mass resulted in hierarchical segregation of the features that are found in the current universe; such as [[galaxy cluster|clusters]] and [[supercluster]]s of [[galaxy|galaxies]].  There are more than one hundred billion galaxies in the universe,[http://astronomy.swin.edu.au/~gmackie/billions.html] To see the Universe in a Grain of Taranaki Sand, Swinburne University each containing hundreds of billions of stars, with each star containing about 10x57th power of [[atoms]] of hydrogen.

The generally accepted scientific [[theory]] which describes the origin and [[evolution]] of the universe is [[Big Bang]] [[cosmology]], which describes the expansion of space from an extremely hot and dense state of [[unknown]] characteristics. The universe underwent a rapid period of cosmic [[inflation]] that flattened out nearly all initial irregularities in the energy density; thereafter the universe expanded and became steadily cooler and less dense. Minor variations in the distribution of mass resulted in [[hierarchical]] [[segregation]] of the features that are found in the current universe; such as clusters and [[supercluster]]s of [[galaxies]].  There are more than one hundred billion galaxies in the universe,[http://astronomy.swin.edu.au/~gmackie/billions.html] To see the Universe in a Grain of Taranaki Sand, Swinburne University each containing hundreds of billions of stars, with each star containing about 10x57th power of [[atoms]] of hydrogen.

<center>For lessons on the related [[topic]] of '''''[[Nebadon]]''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Nebadon '''''this link'''''].</center>

<center>For lessons on the related [[topic]] of '''''[[Nebadon]]''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Nebadon '''''this link'''''].</center>

<center>For lessons on the related [[topic]] of '''''[[Spacetime]]''''', follow [http://nordan.daynal.org/wiki/index.php?title=Spacetime '''''this link'''''].</center>

<center>For lessons on the related [[topic]] of '''''[[Spacetime]]''''', follow [http://nordan.daynal.org/wiki/index.php?title=Spacetime '''''this link'''''].</center>