If the Sun is able to keep Earth warm while being millions of miles away, shouldn’t it get warmer and warmer the closer you get to it (like when you go to space)? Like how it would get warmer if you were to approach a burning house for example?
Because there’s nothing in between the Earth and Sun to be heated. Temperature is a feature of matter, but space is empty so there is no matter to be hit by photons from the sun to be warmed.
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