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 space is empty. Heat as we experience it can only be applied to physical objects that conduct their heat into you. Of course, if you were naked in space, you would feel the heat of the sun, but only directly from the sun. If you faced the sun, you’d die, but your back wouldn’t be getting any heat.
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