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 <[email protected]> wrote: > On 30 November 2013 12:04, Telmo Menezes <[email protected]> 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 [email protected]. > To post to this group, send email to [email protected]. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
