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 measurement of the amount of energy in matter. It’s directly related to the movement or vibration of atoms.
When you heat something you input energy into it and as a result the atoms will move/vibrate faster and faster.
When you cool something you take energy out and as a result the atoms move around less. At the lowest possible temperature, absolute zero, the atoms don’t move around at all anymore. That’s why it’s the lowest temperature, you can’t take any energy out anymore, there’s already no more movement.
Space is vacuum. Since it’s not matter, it can’t have temperature.
Matter in space can have temperature, such as gas clouds, asteroids , spacecraft etc. But space itself is nothing.
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