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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because ‘stuff’ is what we feel warmth from, and that includes air.
You feel ‘warm air’ because the molecules of the air are excited and transferring that energy to you, or your energy is radiating off to them.
space just doesn’t have any of that stuff to be ‘hot’. There’s practically no molecules to get excited.
It also kinda works in reverse. cooling off in space is difficult because there aren’t other molecules to ‘take’ your energy.
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