There's pretty much no evidence that it even exists and nobody knows anything about it. So how do we even know it exists? Yes, galaxies have larger mass than they should if they only contained the visible matter. I don't see how this automatically implies that there's another type of matter that can't be seen. How do we know there's not another explanation for this? Such as black holes. Or maybe something is happening to the EMR, which is stopping us from observing the extra objects which make up for this loss of mass. Maybe they're not even calculating the correct mass of the galaxies. Some recent observations even show that Hubble's law is not always reliable. I mean seriously, I thought this was physics. Since when can they just come up with this dark matter idea with no evidence at all, except for the fact there's some matter that we can't observe which can be caused by a number of reasons. It's like they just do calculations, and when they don't work they make up something. Why don't they ever account for the possibility that their calculations may be wrong? I'm not saying they're wrong, but just because it seems like galaxies don't weigh as much as they should, it doesn't automatically mean that dark matter exists. Is there any other evidence for the existence of dark matter?
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You are a long way from understanding how Physics progresses.
You are lacking the education and knowledge; learn and you'll find out.
They do account for the possibility that they may be wrong. No one is saying that dark matter exists, beyond a shadow of doubt. It's still a theory. The missing mass observation is a reasonably compelling argument for the existence of dark matter, but we aren't absolutely sure what the correct explanation is.
As it happens, black holes don't work because their gravitational effect isn't consistent with out observations. Dark matter is a strong theory because the missing matter has to be reasonably spread out into clouds to satisfy the law of gravitation. Black holes are just the opposite- highly compact, with different gravitational effects.
I'd also like to point out one more bit of evidence. If dark matter didn't exist, then the Universe wouldn't look like it does today. Dark matter lattices are a proposed explanation for why hydrogen accumulated to form stars in the first place. It accounts for how the Universe is expanding in ways that the normal matter we've observed does not.
Other evidence? Yeah and its somewhat compelling. Consider the solar system planets as they orbit the sun - the farther away they are, the slower they revolve. Now consider our galaxy where the stars revolve around the central black hole. Stars further from the center revolve around the hole more slowly than those nearer the hole - like the planets in a solar system, BUT - as you near the galaxy's edge (furthest from the hole), the stars do not continue to slow down - they all seem to revolve at a more or less constant speed.
The easy way out of this is to consider a gravity source beyond the galaxy's edge. But gravity implies the presence of mass - and we cannot see any out there in sufficient quantity to explain the anomalous revolution of edge stars around the central black hole. We can't see it, but it seems to have gravity.
Dark Matter?