- the Big Bang
- ranked #1
- Not Applicable ()
At the very instant of the Big Bang, 13.7 billion years ago, the universe is thought to have had infinite temperature, as it existed as a single, infinitely-small and infinitely-dense point. Just 10 -43 seconds later, known as the Planck time, the universe had cooled to roughly 1.4 x 1032 Kelvin, and expanded to a size of around 10-33 cm across.
The hottest temperature generated on Earth is around 5.5 x 10 12 Kelvin (5.5 trillion Celsius) – more than 360,000 times hotter than the core of the Sun. This was achieved in 2012 using the Large Hadron Collider at CERN in Geneva, Switzerland.