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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It’s not hot, but it’s not really cold either. Temperature refers to the average speed of molecular movement in a sample of some kind of matter. No molecules (or almost none), no measurable temperature.
You might be able to sense the “heat” from the candle, because it emits radiant energy that can travel through a vacuum.
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