Think of it like a pan on the stove. There’s heat energy going in, but it also is losing energy. Depending on how high you turn up your stove those two will balance and it will reach a steady temperature. Like the stove with the pan the sun constantly pumps heat into the planet to stop it cooling down which is a good thing.
Having said that, if you put a lid on the pan it won’t lose as much heat and so the contents will get hotter. This is like what is happening with global warming. Gases that stop the planet giving off as much heat into space are building up and so the planet is warming up.
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