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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There’s a somewhat complicated equation for what temperature is in physics, too complicated for a five year old, but the best way to describe it is the *speed of molecules around you.* the hotter it is, the hotter these molecules are moving. So, these little molecules are moving around and banging into your skin (the hotter it is, the more times a minute these molecules hit your skin) and so your skin takes the energy from these molecules moving around and feels hot (or cold, when your body skin has more energy and is moving around more than the air around it).
In space, there’s no molecules moving around to make your skin feel warm, so it’s not hot because there’s nothing there to *be* hot.
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