Even the coldest known object in the Universe - the creepy-looking Boomerang Nebula - isn't as cold as absolute zero. [2] The models of the origin of the universe based on the Big Bang theory assume that the universe passed through this temperature about 10−43 s (one Planck time) after the Big Bang as a result of enormous entropy expansion. Talking about the coolest possible temperature seems relatively simple. Scientists assert that, just a fraction of a fraction of a fraction of a second after our universe began, spacetime started to vibrate, which caused the universe to come to about 1,000,000,000,000,000,000,000,000,000 (1027) Kelvins. Way back up on the infographic is our biggest achievement in the heat stakes: 5,500,000,000,000 degrees Celsius (9,900,000,000,000 degrees Fahrenheit), which scientists were able to achieve by crashing lead ions against each other in Switzerland's Large Hadron Collider. In physical cosmology, the electroweak epoch was the period in the evolution of the early universe when the temperature of the universe had fallen enough that the strong force separated from the electroweak interaction, but was high enough for electromagnetism and the weak interaction to remain merged into a single electroweak interaction above the critical temperature for electroweak symmetry breaking (159.5±1.5 GeV in the Standard Model of particle physics). This is because it's the coldest an entity can get when every single skerrick of heat energy has been sucked right out of it. How cold is the coldest place in the Universe, that we know of? In the ensuing quark epoch the remaining W and Z bosons decayed, the weak interaction became a short-range force when the Universe was filled with quark–gluon plasma. The coldest of the cold is absolute zero. The former of the three is used as the standard measurement due to persistent issues with unreliable ground and satellite readings. Most recently, scientists at the Massachusetts Institute of technology (MIT) cooled molecules to just 500 billionths of a degree above absolute zero. Most people are pretty familiar with absolute zero, it's -273.15 degrees Celsius (-459.67 degrees Fahrenheit), and it's the lowest possible temperature that can ever be achieved, according to the laws of physics as we know them. It is the highest possible temperature that matter can exist at. © ScienceAlert Pty Ltd. All rights reserved. But what about the hottest possible temperature? However, it is so high (1030 K) that no current or foreseeable experiment can reach it.[5]. ", https://en.wikipedia.org/w/index.php?title=Absolute_hot&oldid=981341276, Creative Commons Attribution-ShareAlike License, This page was last edited on 1 October 2020, at 18:50. As you may know, movement causes friction, which causes heat. Acetylene and pure oxygen burns blue, at over 3,400ºC – the hottest temperature readily achievable with fuel and flame. As you may know, movement causes friction, which causes heat. This is known as Planck Temperature. As the universe expanded and cooled, particle interactions were energetic enough to create large numbers of exotic particles, including stable W and Z bosons and Higgs bosons. Just for comparison, the hottest temperature that we have ever actually encountered is in the Large Hadron Collider. It's the highest possible temperature that matter can attain, according to conventional physics, and well, it's been measured to be exactly 1,420,000,000,000,000,000,000,000,000,000,000 degrees Celsius (2,556,000,000,000,000,000,000,000,000,000,000 degrees Fahrenheit). But theory isn’t necessarily what we observe in our physical reality. The closest that scientists think we ever came to this temperature is, unsurprisingly, just after the Big Bang. I understand and agree that registration on or use of this site constitutes agreement to its User Agreement and Privacy Policy, scientists at the Massachusetts Institute of technology. "Absolute Hot: Is there an opposite to absolute zero? There is none!? But this quickly ended. As such, it seems that the highest possible known temperature is 142 nonillion kelvins (1032 K.). Talking about the coolest possible temperature seems relatively simple. Contemporary models of physical cosmology postulate that the highest possible temperature is the Planck temperature, which has the value 1.416785(71)×1032 kelvin, or about 2.55×1032 fahrenheit.

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