So I should just take your word for all this, and not try to understand?
You can take my word for it, if you want.
But why can't you see that it is correct for yourself.
You aren't even making any attempt to understand.
It's simple. It's just gravity. What exactly is your problem with this?
If you put two apples side by side, what happens?
If you put two planets side by side, what happens?
It truly is simple. I don't see why you are having trouble with this.
Perhaps, stating the obvious (from Newton's formula for gravity) might help;
For a fixed distance of separation, the gravitational force of attraction between two objects, is proportional to the product of their masses.
Make it even simpler. Assume both objects have the same mass.
Then the force, pulling the objects together, is proportional to the mass squared. You get the idea?
