Liz, There are 7 other repeatable observations explained by dark matter. From wiki-dark matter
- 3.1 Galaxy rotation curves<http://en.wikipedia.org/wiki/Dark_matter#Galaxy_rotation_curves> - 3.2 Velocity dispersions of galaxies<http://en.wikipedia.org/wiki/Dark_matter#Velocity_dispersions_of_galaxies> - 3.3 Galaxy clusters and gravitational lensing<http://en.wikipedia.org/wiki/Dark_matter#Galaxy_clusters_and_gravitational_lensing> - 3.4 Cosmic microwave background<http://en.wikipedia.org/wiki/Dark_matter#Cosmic_microwave_background> - 3.5 Sky surveys and baryon acoustic oscillations<http://en.wikipedia.org/wiki/Dark_matter#Sky_surveys_and_baryon_acoustic_oscillations> - 3.6 Type Ia supernovae distance measurements<http://en.wikipedia.org/wiki/Dark_matter#Type_Ia_supernovae_distance_measurements> - 3.7 Lyman-alpha forest<http://en.wikipedia.org/wiki/Dark_matter#Lyman-alpha_forest> - 3.8 Structure formation<http://en.wikipedia.org/wiki/Dark_matter#Structure_formation> On Sun, Dec 1, 2013 at 4:58 PM, LizR <lizj...@gmail.com> wrote: > On 30 November 2013 12:04, Telmo Menezes <te...@telmomenezes.com> wrote: > >> >> Thanks for the explanations. Ok, I think I now understand why dark >> matter is the best hypothesis. >> >> It is, to date. Neverthless, you would have been quite correct had it > been the anomaly in the orbit of Mercury that you were trying to explain, > rather than the anomalous rotation of galaxies observed in 1933 by Fritz > Zwicky. Pre-Einstein, various theories were advanced to explain the > anomalous perihelion advance of Mercury (relative to what Newtonian > gravitation predicted it should have been) including "hidden matter" - an > undetected planet (called Vulcan, as Trekkies and Dr Who fans will > appreciate) and an odd mass distribution inside the Sun. > > But in that case, it turned out that the best answer WAS to modify gravity. > > So far DM has remained the top explanation even as more phenomena > involving it have been discovered (garvitational lensing for example). Some > of its characteristics are now fairly well measured; its nature remains > unexplained... which makes life interesting for particle physicists and > cosmologists. > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to everything-list+unsubscr...@googlegroups.com. > To post to this group, send email to everything-list@googlegroups.com. > Visit this group at http://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
