Guess what? Katie asked the "Curious Kids" team a similar question !!
"What a great question!
First off, to understand what heat is, you need to know that everything you can touch or see is made up of tiny building blocks called atoms. Atoms are so small that you can’t even see them (except with some very special equipment) – yet they make up all the matter in the universe.
If something is hot, it means that its atoms have lots of energy and are bouncing around. If something is cold, its atoms have much less energy and they stay quite still.
It’s true that space is a vacuum, which means that there isn’t much matter floating around out there. Space isn’t a perfect vacuum though. Even if we ignore the big stuff like stars, planets and comets, space is not completely empty.
In fact, the sun is constantly blowing matter, known as the solar wind, out into our solar system. This is part of what causes the beautiful light display we call the aurora.
But the solar wind isn’t very dense - it has much, much fewer atoms in it than air, for example. This means it can’t carry much heat in it and so it can’t explain how the warmth from the sun reaches Earth. There are three ways heat can be shared: conduction, convection and radiation. Let’s think about each of these in turn, to discover which one allows heat to travel through space."
So, NoOpinion, can you answer the question put to Katie?
Is heat transferred through space by conduction, convection or radiation?
Read on for the answer !!
https://theconversation.com/curious-kids-how-does-heat-travel-through-space-if-space-is-a-vacuum-111889
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