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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“heat” is the energy of moving molecules. more movement means more heat, less movement means less heat. no movement means “absolute zero” (-273 C, or 0 K). since space has nothing in it, there are no molecules to move. the biggest danger to human skin isn’t the temperature, it’s the various radiation coming off the nearby star… with scuba gear and SPF 9000, you could conceivably survive out there naked (don’t touch the metal, tho… that radiation may cause it to be hot enough to give you burns! also, metals may get vacuum-welded together)
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