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Ask Dr. Universe: Why is space so cold?

Dr-Universe-230PULLMAN, Wash. – It is very cold in space, but it wasn’t always that way. That’s what I learned from my friend Guy Worthey, a professor of astronomy here at Washington State University.

He explained that when we talk about temperature, we are really talking about the jiggle motions of molecules, the tiny building blocks that make up everything around us. The more energetically the molecules jiggle, the higher the temperature.

When the universe was younger it was a really hot place.

Read all of this answer from Dr. Universe here.


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A service of Washington State University, Ask Dr. Universe answers some of the most interesting, tough and smart questions from curious kids all around the world.



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