text: lowest possible temperature attainable ?? the lowest possible temperature attainable is believed to be '-273 celcius'. is this limited to only our earth or its -273 celcius for even the farthest planets like neptune and pluto? absolute zero is the lowest temperature you can get at -273 celsius anywhere in the universe. almost all motion has stopped at that point. it is also the temperature at which no further energy can be extracted from a physical body, or the temperature at which the entropies of perfect crystals vanish, or the temperature at which the entropy change of an adiabatic process vanishes.  it was first proposed by  guillaume amontons in 1702 who was investigating the relationship between pressure and temperature in gases. he lacked precise thermometers to determine an exact point. in 1848, lord kelvin proposed an absolute thermodynamic temperature scale where absolute zero was the temperature at which no more temperature can be removed. absolute zero has never been reached and may well never be. in the absolute depths of outer space, it reaches 3 kelvin due to the remnants of the big bang. laboratories have reached billionths of a degree above absolute zero in order to demonstrate bose-einstein condensation.