This video does a great job of putting heat and cold into a universal perspective with the prinicples of E = mc2:

What’s the hottest place in the universe? What’s it like inside a Black Hole? This video climbs the power scales of the universe, from the coldest and bleakest reaches of our galaxy on out to the hottest and most violent places known. How and where do Earth and humanity fit within the immensely powerful scales that define our universe?

All across the immense reaches of time and space, energy is being exchanged, transferred, released, in a great cosmic pinball game we call our universe.

Let’s check out some energy perspectives on a galactic level in the video on page 2

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