Firstly can I congratulate Max Planck for becoming a massive part of human history with a name like that...
On to the theory, this is taken from Wikipedia:
As for most of Planck units, a Planck temperature of 1 (unity) is a fundamental limit of quantum theory, in combination with gravitation, as presently understood. In other words, the wavelength of an object can be calculated by its temperature. If an object were to reach the temperature of 1.41 x 1032 Kelvin (TP), the radiation it would emit would have a wavelength of 1.616 x 10−26 nanometers (Planck length), at which point quantum gravitational effects become relevant. At temperatures greater than or equal to TP, current physical theory breaks down because we lack a theory of quantum gravity.[2]
Wow, so at a temperature of 142,000,000,000,000,000,000,000,000,000,000 physics breaks down!
So, basically, someone needs to fucking hurry up and understand quantum gravity... count me out, I have difficulty sorting my socks out in the morning.