(January 9, 2012 at 1:28 am)popeyespappy Wrote: Modified Newtonian Dynamics (MOND) was first proposed in 1983 by Mordehai Milgrom as a way to account for the Gaxaly Rotation Problem. Basically MOND says that acceleration may not be linearly proportional to force at small values. MOND can be used to predict the relationship between the mass of galaxies and their rotational velocity. This is something the competing theory of dark matter/energy can’t do accurately.
New observations have recently allowed a sample of 47 gas rich low mass galaxies to be examined. The relationship between mass and rotation velocity was checked. All 47 galaxies fell at or very near the MOND prediction. Dark matter models didn’t fare nearly as well.
Linky
Quote:McGaugh’s new paper doesn’t give any evidence at all against dark matter. What it does is to claim that an alternative theory — MOND, which replaces dark matter with a modification of Newtonian dynamics — provides a good fit to a certain class of gas-rich galaxies. That’s an interesting result! Just not the result the headlines would have you believe.Dark Matter: Just Fine, Thanks.
It’s obvious what happens here. Nobody would read an article entitled “Gas rich galaxies confirm prediction of modified gravity theory” — or at least, most editors doubtless feel, fewer people would be interested in that than in evidence that went directly against dark matter. So let’s just spice up the story a bit by highlighting the most dramatic possible conclusion we can imagine drawing, and burying the caveats until the end. Net result: a few more people read the articles than otherwise would have, while many more people just read the headlines and are left with less understanding of modern cosmology than they started with.
