HOW THE UNIVERSE COOLED OVER TIME
from Universe
Still, also everything that followed is a story of cooling, If the early macrocosm was defined by extreme heat. Not sudden, not chaotic, but steady and deeply connected to one simple process — the expansion of space itself. This is the crucial idea. The macrocosm is n't cooling because it's losing heat into commodity colder outside. There's no outside. rather, it's cooling because it's stretching, and as space stretches, energy spreads thinner. What this really means is that temperature drops not because energy disappears, but because it becomes more adulterated across a larger and larger volume.
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