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 <yann...@gmail.com> 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 <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.
>>
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