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Absolute zero is the practical minimum of [[Temperature|temperature]], defined as 0 [[Kelvin]] on the [[absolute temperature scale]]s (the zero on the Kelvin scale has had to adjust, slightly, as measurements of absolute zero are refined).  This corresponds to -273.15 degrees [[Celsius]] and -459.67 degrees [[Fahrenheit]]. At absolute zero, all thermal motion (i.e. the movement of [[Molecule|molecules]] in a [[States of matter#gaseous|gas]], [[Atom|atoms]] in a [[Crystal|crystal]]) would cease.

Absolute zero is the practical minimum of [[Temperature|temperature]], defined as 0 [[Kelvin]] on the [[absolute temperature scale]]s (the zero on the Kelvin scale has had to adjust, slightly, as measurements of absolute zero are refined).  This corresponds to -273.15 degrees [[Celsius]] and -459.67 degrees [[Fahrenheit]]. At absolute zero, all thermal motion (i.e. the movement of [[Molecule|molecules]] in a [[States of matter#gaseous|gas]], [[Atom|atoms]] in a [[Crystal|crystal]]) would cease.

No place in our universe can reach absolute zero, but there are places that get close. [[Space]] is approximately 2.73 Kelvin. This is not because heat from [[star|stars]] in the universe keep the temperature up, but because of [[Black-Body Radiation]], which occupies the [[vacuum]] of space. This [[radiation]] keeps the universe at this temperature. The [[Cosmic Background Explorer]] measured this value. It has since been theorized that this residual heat energy is leftover from the [[Big Bang]], the theorized beginning of our universe, although this has not been proven.

No place in our universe can reach absolute zero, but there are places that get close. [[Space]] is approximately 2.73 Kelvin. This is not because heat from [[star|stars]] in the universe keep the temperature up, but because of [[Black-Body Radiation]], which occupies the [[vacuum]] of space. This [[radiation]] keeps the universe at this temperature. The [[Cosmic Background Explorer]], (CBE), measured this value. The [[Big Bang]] theory predicted a leftover background radiation and that such radiation would have a relative uniformity, which is reinforced by the evidence presented by the CBE's observations.

== Reaching Towards Absolute Zero ==

== Reaching Towards Absolute Zero ==