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InterplanetaryFlight3 karma

Hello Dr. Castelaz,

I know we can visualize gravity of objects in space similarly to this: (http://upload.wikimedia.org/wikipedia/commons/d/d1/GPB_circling_earth.jpg).

But how would we visualize gravity when it comes to the scale of a galaxy? Does the visualization of gravity react the same way as it would with Earth as it does with a galaxy? With all the mass in a galaxy, I wonder if it all would become collective and form a global pool of mass? If not, what defines the mass of a galaxy?

Probably a stupid question.