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 thermal energy transferred between systems due to a temperature difference.
Thermal energy is kinetic energy of atoms vibrating and colliding in a substance.
Space is the absence of atoms! So there is nothing to vibrate.
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