It’s kind of hard to picture, but there are two main points to this; space is really, really big and everything in it is, relatively, really small. It’s actually really hard to get something to fall into the Sun; it’s just too far away to hit unless you are really, really accurate.
And if by a one in a million chance you were a floating mass in space with a perfect trajectory into the sun, you would’ve crashed into it hundreds of millions of years ago.
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