[ Or that our understanding of how gravity works is incomplete.
I’m perfectly willing to consider the possibility of dark matter, and the even more weird dark energy.
But to assume as a fact the existence of something we cannot see in order to make what we can see fit the theories is not a very scientific approach. ]
The “rubber sheet and marble” analogy of Gravity it WRONG WRONG WRONG!
http://en.wikipedia.org/wiki/Gravitational_well#The_rubber-sheet_model
They forget about what it below the “sheet”.
Ok! thought experiment time:
Take a large kiddie pool and fill it up to the brim with water. Now stretch a sheet of rubber over it and seal it so no air can get in and no water can get out.
NOW place a heave marble in it and observer what happens to the sheet...
It does the same as before but what happens to the outside edge of the sheet.... It RISES!!!!!
That is your so called “Repulsive Dark Energy”
Morons couldn’t understand gravity because their assumption about the dimension below space time is wrong.
Well, we are all morons as none of us understand. Perhaps because we are reaching 'too far'.
As another poster said, We don't really completely understand Gravity and Magnetism, yet we claim to be able to define the nature of the cosmos.
P.S. In support of your space/time rubber sheet comment, consider that the ‘description’ given of a ‘black hole’ is much like your ‘rubber sheet’ and very two-dimensional and highly improbable.
Anyway, all theories are just attempts to explain what we don’t yet understand. Most of the time, we are wrong. The few times we are right are what make up the body of our science.