Thanks, that's an impressive list. I'd be rather surprised if "bolt-on extras to GR" can explain all those.
On 2 December 2013 12:43, Richard Ruquist <[email protected]> wrote: > 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. > -- 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.
