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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“Hot” is a word we use to describe what it feels like when atoms/molecules are moving around a lot. In space, there are basically no atom/molecules *to* move around.
In other words, heat is a characteristic of matter, of “stuff”. Space is not matter, it’s a whole lot of “no stuff”.
The sun warms stuff up when its light hits the stuff. But empty space has no stuff to get hit by the light.
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