Wtf is dark matter. There’s something out there that makes gravity not work the way we expect on a very large scale, and “dark matter” is a theoretical substance that makes the math work out properly. But the fact that such a huge portion of the galaxy’s mass is this hypothetical, undetectable thing makes it seem very hand wavy. The last experiment to try to detect dark matter that I’m aware of concluded with “we successfully didn’t detect anything” 😞 having to deal with dark matter feels like trying to study atoms before the discovery of the neutron. I hope we figure this out in my lifetime.
Dark matter might not even exist, all we know is that gravity-based predictions break down after a certain point. Dark matter is the just the most popular proposed solution where you essentially just add extra undetectable mass until it works. The distant second is Modified Newtonian Dynamics (MOND) or some variation of it, which is where you try to tweak the theories to fit observations instead. It has the same problem as dark matter where we keep coming up with better experiments which always fail to find anything.
There’s a similar problem at the opposite end of the scale spectrum too; quantum mechanics doesn’t play nice with our current understanding of gravity leading to the search for the “theory of everything”. This is why I personally lean towards the idea that it’s our theories that are wrong and not an undetectable mass, but this isn’t my field so my opinion isn’t worth much (especially since a majority actually working in the field lean towards dark matter as far as I can tell).
How does the Universe expand? Isn’t the Universe the container space of all that which exists, where does it expand to?
In the depth of pandemic lockdown, after my roommate moved out to return closer to family, I was in my house alone for a month straight. One day I hear the tea kettle whistling on the stove.
It was the middle of summer, I hadn’t made tea in weeks. Maybe I bumped the stove control? But there shouldn’t have been any water in the kettle. And I hadn’t been in my kitchen for over an hour and it wouldn’t have taken that long for the water to boil had I put it on and just forgotten about it somehow. I keep my doors locked.
Idk, the only thing I can think of is the isolation really got to me that day, I put the kettle on and completely forgot I had done it five minutes later.
