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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Temperature is a representation of the average kinetic energy of the particles in a material.
Space has no particles. Space has no temperature.
Here on earth, we have a bunch of atoms and molecules and shit constantly flying around and bumping into each other. When it’s cold, they fly slower and bump into each other less. When it’s warm, they fly faster and bump into each other more. Temperature is a representation of the speed/collisions between those particles.
Space is empty.
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