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ELI5: why isn't space hot? More detailed question in comments
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Ok, so I understand that space is a vacuum, what I don't quite get is how is the heat, from our sun for example, doesn't warm the space it travels through to get to earth. Light/heat leaves the sun, travels through space and then warms up the earth. What happens to that heat while it's traveling to earth, and and why does it warm the earth but not the space?

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