-sul4bh Since long I have been thinking about this topic "If there is the coldest temperature ever possible, the absolute zero, then there must also be hottest temperature". I found this QA somewhere, read... Dear Cecil: What is the opposite of absolute zero? I can accept the idea that there's a coldest possible temperature, but I like my limits in pairs. Is there a limit to how hot things can get? If so, what is it and why is it? --Mark Stewart, Chicago Dear Mark: There is a limit, sort of, but it's so inconceivably large that nobody but high energy physicists talks about it (although as I think about it absolute zero doesn't exactly qualify as breakfast table chatter either). The highest possible temperature, called the Planck temperature, is equal to 10^32 degrees Kelvin. For comparison, the center of the sun bubbles along at 15 million degrees K (15 x 10^6); silicon can be created by fusion at 1 billion K (10^9). In short, the Planck temperature is very toasty