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Message: <blockquote data-quote="Janx" data-source="post: 6042603" data-attributes="member: 8835">That makes sense to me.Personally, I'd be wondering how a dude could know how much mass is in a galaxy.  At best, with a great telescope, you can make out all the stars.  Assign an average mass per star type and add it all up.I'm also guessing that you have math that says if you know how much mass these objects have, you can calculate their orbit, speed, etc.  Something that us layman might not realize, as we figure that space stuff is positioned and moving at whatever speed it coagulated at.  this would be by nature of the bowling ball on a bed effect of gravity, I assume.It sounds like that basic math came out a little short, and the preferred reason was that they guessed wrong on the total mass.  The difference between the "required" mass to match reality and the calculated mass being the existancce of "dark matter"It's also possible the formula just doesn't scale to galactic proportions yet.  I reckon that's what the MOND theory stuff is about, finding a different formula instead.Which might really be matter the scientists forgot to count (maybe every star has way more heavy atoms at the center), or the existance of a mystery matter that is invisible, or planets, as we sure haven't found all of them yet.  Given that we can't get there to just scoop some up, I reckon it's understandable on why it remains a mystery.I see no reason to get cranky about Umbran's dark matter thing.  I trust that if he finds a better explanation, he'll switch to that instead.</blockquote>

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