Comments on: You Are Here

By: Elliot

Elliot — Tue, 08 Aug 2006 03:47:37 +0000

Jason,

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

By: Jason M. Hendler

Jason M. Hendler — Tue, 08 Aug 2006 03:19:14 +0000

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.

By: Elliot

Elliot — Fri, 21 Jul 2006 19:09:09 +0000

Jason,

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

By: Jason M. Hendler

Jason M. Hendler — Thu, 20 Jul 2006 18:40:33 +0000

Are there any blogs on gravity? Looking at this map, and understanding that Newton’s laws on gravity don’t seem to work on a galactic scale, leads me to believe gravity is actually a pushing force or pressure within the medium, and not a pulling force within a mass, but I can’t find anyplace to discuss this.

By: B

Tue, 18 Jul 2006 13:04:29 +0000

Happy Birthday
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.

By: Elliot

Elliot — Tue, 18 Jul 2006 01:54:09 +0000

Lubos is too far to the right to be visible. Peter is not connected because there can’t be any strings to attach him to the rest of the blogoverse since strings don’t exist.

By: cynic

cynic — Mon, 17 Jul 2006 17:40:32 +0000

Best birthday wishes to all at CV. The interactive map is a blast; it led me to all manner of entertaining material. Have you located Lubos and Woit in amongst the other, predominantly perhaps less right-on, dots?

By: wolfgang

wolfgang — Mon, 17 Jul 2006 15:44:01 +0000

Happy Birthday!

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