Gravitation not tied to any material source is indeed a conundrum, because any such material sources of gravitation are pulled together & condense into big stuff like black holes that can be more readily detected. This eliminates the possibility of large numbers of ronin osmium asteroids/planets wandering about, because they would eventually coalesce into something visible. (Are there theories of solar system evolution that would result in 80% of the material being ejected?? The one paper about panspermia indicated that upwards of 20% of ronin asteroids could be ejected from the solar system. But I guess all of these theories are based on the total amount of material being infinitesimal compared with the mass of Jupiter & the Sun.) Perhaps it is time to dust off theories that allow for negative gravitational bodies, so that polarization, shielding, and other phenomena can be possible ??? At 11:11 AM 4/18/2012, Warren Smith wrote:
The universe is supposedly 4.6% ordinary matter, 22.7% unknown "dark matter" (not made of known particles), and the rest is Einstein's cosmical constant.
However, this study of stellar motions in our galaxy claims the dark matter is not present in our region of the galaxy. How can this incredible discrepancy be explained?
I have no idea... (Not as easy to see how they could have made such a huge mistake, unlike the "faster than light neutrinos" case...):
http://www.sciencedaily.com/releases/2012/04/120418111923.htm
-- Warren D. Smith http://RangeVoting.org