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[–] [deleted] 2 points 0 points (+2|-2) ago 

[Deleted]

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[–] BandBang 2 points 0 points (+2|-2) ago  (edited ago)

i think youre mistaken, its theorized... its never been directly observed

Gravity exists in galaxies that exceeds what the measured matter can produce Hence the made up name dark matter, which accounts for the "extra" gravity.

this was my point, it is something invented to make their math work. same as with black holes, does it exist maybe maybe not... but now 2+2=4 for them, but this doesn't mean it exists..

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[–] MyDrunkAccount 1 point -1 points (+0|-1) ago 

Well, there's really no other way to put it though. I not a physicist but the way I understand it is that we can calculate the amount of gravity we can expect from a certain amount of mass and vice versa. This math has been tested and works, just look up the details of the Rosetta Sattelite, we launched it in 2004, in 2007 it made a Mars gravity assist followed by two asteroid flybys, and finally in 2014 (10 years after launch) it reached its target and established orbit around a 2.5x2.7mile rock traveling at 84,000mph. When this same math is used to calculate the mass:gravity of other galaxies, however, there are huge and varying discrepancies, almost like there's some kind of extra invisible bunches/pockets of mass floating around which can even be extrapolated and plotted by the gravitational forces it produces. In this case it's not easy to dismiss the math because we've shown that it works, so, they instead chalked it up to something that we don't know how to detect yet and gave it a name.

But like I said, that's just how I understood it from what I've been told, so take it with a grain of salt and heavy scrutiny.