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→Reaching Absolute Zero: Towards
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]] 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.
== Reaching Absolute Zero ==
== Reaching Towards Absolute Zero ==
It is considered theoretically impossible to achieve absolute Zero, but scientists have come quite close. The first example of this occured in [[1908]] when [[Kammerlingh Onnes]] liquified [[Helium]]. The temperature he reached was approximately four Kelivn. Lower temperatures have been reached with different [[isotope|isotopes]] of Helium. A temperature of 0.3 Kelvin has been reached with <sup>3</sup>He. The lowest temperature ever reached by any substance was 280 picoKelvin.
It is considered theoretically impossible to achieve absolute Zero, but scientists have come quite close. The first example of this occured in [[1908]] when [[Kammerlingh Onnes]] liquified [[Helium]]. The temperature he reached was approximately four Kelivn. Lower temperatures have been reached with different [[isotope|isotopes]] of Helium. A temperature of 0.3 Kelvin has been reached with <sup>3</sup>He. The lowest temperature ever reached by any substance was 280 picoKelvin.