The sun warms up our planet but space is cold. If I lit a candle and stood 20 feet away, I could see the light but not feel the warmth. So, why do we feel warmth from the sun but space isn’t warmed by it?
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Heat is basically just a measurement of stuff moving around. When you feel hot, it means a lot of stuff is moving near you (the air, for example).
In space, there’s almost no stuff. Because of that, there’s basically no heat.
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