Can you explain what you mean by 'bolt-on extras to GR'?
On Sun, Dec 1, 2013 at 7:18 PM, LizR <[email protected]> wrote: > 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. > -- 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.
