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Originally Posted by .?.
Surface and MASS are two entirely different things, you silly monkey!
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Yes they are so to fully answer a previous question about a planet with the same surface but more mass then earth you need only realize that the weight of the planet(mass) is pushing against space also much like a big boat pushing against the surface of the sea. The bigger boat creates more pressure on the surface and will displace water; but the weight of space is far more than any ocean and no planet is big enough to displace space thus space pushes back on the object with the same pressure created by the mass of the object.
Analogy: Take a drum and tighten the head of the drum to a set point(this is the weight of space); now select two balls(planets) of different weight. Each ball will make a different size impression on the drum head when rested on top. The deeper impression will create the most tension on the drum head; so even though the drum head(weight of space) is stable and set it still pushes harder against the more massive object.
It's clear hear that when both balls are rested on the drum head the heavier ball will affect the pressure on the smaller ball if the smaller ball is close enough. If the big ball is big enough it will indent the drum head to the point where the smaller ball will be sucked in and possibly collide. If you move the bigger ball on the surface the smaller ball will also move(if close enough).
If the bigger ball is moved in a circle the smaller ball will be forced to circle around the large one as in orbit.
So add 8 more differrent sized balls to the drum head and move the bigger ball in a circle and you will create the solar system.