The Heat

You wouldn't want to go back in time to see the creation of the universe, even if your time travel device had the ideal self-contained life support system to prevent you from being suffocated by all the black hydrogen and a droning noise from becoming lodged in your mind. The early universe had a high temperature. According to some calculations, everything was one quadrillion, or 1,000 trillion, degrees Celsius, after the expansion started. It is around 20 billion times hotter than the sun's center. Personally, I don't think our time machine could withstand that.

It becomes quite astounding that it is only around 250 times hotter than anything that humanity has ever made when one considers the relative temperature. It was accomplished in 2010 by an atom smasher akin to the renowned Large Hadron Collider near Geneva, Switzerland, that was employed at Brookhaven National Laboratory in the state of New York. The melting point of subatomic particles like quarks is two trillion degrees, according to one of the results. As a result, for a brief while, researchers in the vicinity of Upton, New York, blasting gold particles at one another, were able to provide a view into the haze at the beginning of the universe.