We are made to believe that the second option is true, since there is no reason why two electrically neutral masses would attract each other. However that would bring me to an even fundamental question, how would you define the physical properties of spacetime fabric so that it would be able to achieve spatial wraping.
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Originally Posted by Profpat  A great question Dipayankar ( I've missed your penetrating question BTW )
I've seen it described both ways, i.e. as a force between two massive objects, but also ( which is more to my liking ) as an effect. This I vision, as the spatial warping, that large objects cause in the fabric of space.
What do you think?
Best to you,
Pat
P.S. Negative gravity, such as a quasar being spewed out by a black hole may be a force, due to negative pressure. |