Question

why earth has gravity?

Answer 1

You exert the same gravitational force on Earth that it does on you. But because Earth is so much more massive than you, your force doesn't really have an effect our planet.

I Hope it help u
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Answer 2

every object posses gravitational attraction towards other objects....it depends on the size of. object.... even u are attracting ur phone towards u but it is not happening because ur mass is less If ur size is like the size of earth u will also start attracting other objects...
I hope it helps you