Thanks to both of you, Thomas and Clipka. Yes, I assumed it is the
amount of matter, like mountains or valley which have the one or another
influence. But I wonder, if also the TYPE OF MATTER has influence, too.
Example: I wonder, if a iron sphere of 10,000 km diameter produces the
same gravity as a styrofoam sphere of 10,000 km diameter. I believe, not
only the amount of matter matters, but the type of matter matters, too.
Am I right?

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