/sci/ - Science & Math

remember when ppl used to get upset over blackface acts

>>11305592
probably some kind of gay college theme party

>>11192669
That isn't the case, Ken Freeman's original concept of dark matter was reverse engineered by figuring out how much invisible mass would need to be present in a galaxy to account for the galaxy's apparent rotational velocity in a very simplistic model of how gravity works in a galaxy. This was the early 1980s and vast computing power wasn't available back then for simulations involving copious point masses, there weren't (and still aren't) analytical functions which describe multibody gravity which includes factors for the light travel time of gravitational disturbances as well as Hubble expansion, neither of which are small enough to neglect across the width of a galaxy.
Furthermore there are other "lesser" (non-Harvard) astronomers who have some models which can predict galactic rotation curves without needing to create imaginary invisible matter to make the numbers add up. Theres an Iranian guy who published something in 2013 which impressed me with thoroughness and accuracy, but Kip Thorne suspiciously won't give the guy the time of day.
https://en.wikipedia.org/wiki/Galaxy_rotation_curve#Alternatives_to_dark_matter
Einstein arrogantly (stupidly) ignored Bose for years until Einstein realized that Bose understood physics better than himself and could be useful.
https://en.wikipedia.org/wiki/Satyendra_Nath_Bose#Bose–Einstein_statistics

>FTL travel violates causality