The Heat Death of the Universe

1465 WordsDec 13, 20106 Pages
The hypothesis about heat death of the universe Our knowledge of the universe is still negligible, and we can not confidently assert that the universe is not under the influence of external forces, or may be considered as a thermodynamic system. However, it is the concept of heat death was the first step to realize the possible finiteness of the Universe, although we do not know when and on what scenario will happen of its destruction. At the present stage of existence (13.72 billion years), the universe radiates as a black body with a temperature of 2,725 K. Its maximum to the frequency 160.4 GHz (microwave radiation), which corresponds to a wavelength of 1.9 mm. It is isotropic up to 0,001% - the standard deviation of temperature is…show more content…
Thus, such a state is not in thermal equilibrium, and in fact there is no thermal equilibrium for such a system, as it is thermodynamically unstable.[8][9] However, in the heat death scenario, the energy density is so low that the system can be thought of as non-gravitational, such that a state in which energy is uniformly distributed is a thermal equilibrium state, i.e., the state of maximal entropy. The final state of the universe depends on the assumptions made about its ultimate fate, and these assumptions have varied considerably over the late 20th century and early 21st century. In a "closed" universe that undergoes recollapse, a heat death is expected to occur, with the universe approaching arbitrarily high temperature and maximal entropy as the end of the collapse approaches.[citation needed] In an "open" or "flat" universe that continues expanding indefinitely, a heat death is also expected to occur[citation needed], with the universe cooling to approach absolute zero temperature and approaching a state of maximal entropy over a very long time period. There is dispute over whether or not an expanding universe can approach maximal entropy; it has been proposed that in an expanding universe, the value of maximum entropy increases faster than the universe gains entropy, causing the
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