For your reference…

http://www.astronomy.ohio-state.edu/~ryden/ast162_7/notes30.html

the resolution to the issue is not changing the nature of gravity but determining the constituents of dark matter.

Regards,

Elliot

Instead of calling such a theory “crackpot”, please state some observation or fact that would make such a theory obviously false.

The observation I point to, that the speed of stars circling the galactic center is constant until you reach the visible edge of the galaxy, is clearly in violation of Newton’s inverse square law, but makes sense if gravity is acting from the outside and is effectively blocked by galactic mass / density reached at the visible edge. Otherwise, you would have to have variable gravity theories to explain it, which seems far less likely.

With all due respect, you would be investing your time unwisely discussing that possibility. You may find a discussion on this somewhere on the interenet but it would fall into the realm of what is politely referred to as “crackpot” theories.

There are plenty of F. A. Q.s on the old usenet (now google) newsgroups sci.physics and sci.physics.research that should answer your questions about the nature of gravity.

Regards,

Elliot

Thanks for the map – that is great! I am waiting for someone to do the same with the refers-to and cited-by mess on the arXiv.

Best, B.

Here is something I wanted to ask for some time. Why is Mali’s flag the url icon for Cosmic Variance?