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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The only heat that space can hold is radiant energy from stars. There is no matter in space to hold conductive heat (kinetic energy) so it has no temperature besides the background radiation from stars, which is very little if you aren’t near one. Thus, the “temperature” of space is is very very cold. This doesn’t mean you’ll instantly freeze anything that goes into the vacuum, that is entirely dependent on the material put into space and its ability to radiate heat. This usually means hours before something will cool to freezing temperature.
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