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Wasn't it last year that the presumed count of red dwarf stars in the universe had to be corrected to a much larger number than previously thought?[0] If we ca
by tokai 10y ago
Wasn't it last year that the presumed count of red dwarf stars in the universe had to be corrected to a much larger number than previously thought?[0]
If we can be wildly wrong about the number of red dwarfs couldn't we just as well be wrong about the number of brown dwarfs, rogue planets and other massive but dim/dark objects in the universe?
edit: Last year? More like 6 years ago. I feel old now.
[0]https://www.cfa.harvard.edu/news/2010-26 https://www.cfa.harvard.edu/news/2010-26
- yk 10y agoIn principle, yes. However, there is not only evidence for dark matter from galaxy rotation curves but also from large scale structure simulations and especially from the CMB. The interesting thing is, the CMB observations, which react to the number of particles in the standard model, agree rather well with rotation curves. (And IIRC there is also a way to disentangle structure formation from simple gravitational interactions, so there are "2 and a half" independent observations which indicate dark matter or something that closely resembles dark matter.