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Dear Scientists: I've been learning about how gravity works, and I wanted to know this: If little things are attracted to huge things, would tiny particles always be flying towards us? Please help. Thank you!
Question Date: 2017-03-31
Answer 1:

One easy way of thinking about gravity is that it's like a trampoline. If you sit in the center of a trampoline, you make a dent in it and whatever is on the trampoline (imagine, a lot of small balls for example) will roll toward you because you're making a dent. Here is an image of the Earth on a trampoline to show the idea: Earth on a trampoline . Now, if you got off the trampoline and put a small rock on it, it would still attract other small balls on the trampoline toward it, but since it has less mass, it will be much weaker in doing so. Now, if you got back on the trampoline and sat near to the rock, you would attract all the small balls much more strongly than the rock, so all the little things roll at you instead of the rock. This is the same idea with us on the Earth: the Earth attracts many many space objects and meteors, and we attract none because relative to the Earth, we don't have nearly enough mass. We are too tiny to make a significant difference.



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