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Great example, and this brings up a great point about this topic - there's a difference between what's a scientific pursuit vs. what is current established scientific understanding.
Dark matter is a topic being studied to try to find evidence of it existing, but as of now there's is zero physical evidence that it actually exists.
Its observed gravitational effects is evidence. Otherwise nobody would have given it a name.
Proof of gravity from an unknown source affecting an object isn't indicative of that source's characteristics, though.
We don't even know if the force involved is gravity. In fact we don't even know if a force is involved at all.
I mean yeah that's why it's called dark matter. Because we know nothing about it except that it has gravity and doesn't interact much (if at all) with electromagnetic waves.
The problem is Dark Matter is a theory that proposes specifically currently unobserved matter exists to solve our math problem. That's not something we can automatically assume, imo. It's looking highly probable, but not certain. It's not just a blanket term for impossible to understand forces, okay, it's not a pseudonym for C'Thulu, it's a very specific solution among many.
Nobody "automatically assumes" anything. Dark matter is the best candidate of possible explanations because it explains observation and still fits the standard model. Even if they find the necessary particles eventually, nobody would call it certain though. Certainty is a unicorn.
People in this thread literally are calling it a certainty. I've basically said the exact same thing as you and gotten downvoted to heck for it.
Well, not really. Your first reply to me got downvoted because you setup a strawman - arguing against something that wasn't even the point.
Your second, the one you claimed said the same as mine, insinuated Dark Matter is just some mathy explanation among many. This doesn't give it credit. It's the current no 1 explanation with lots of evidence. Still didn't get downvoted though.