

It’s a math thing, more than a physics thing.
With Newtons law of gravity, there is a big, but seemingly solved problem that’s been known for a long time: things must not touch. Potential energy is calculated by dividing a term by the distance of two objects. You can’t devide by zero, so if the distance goes to zero, energy goes to infinity, which doesn’t make sense. The solution is to prevent the centers of mass of things from touching. This isn’t a problem, because in real life, masses aren’t points, but solid objects and the centers of mass are in the middle, so they can’t touch, because the outer parts collide first. And in simulations you can just make a rule that says no touching.
This kind of gap in a formula, where it stops being defined, is called a singularity in math. And to deal with them, you just have to know, when to expect them. For hundreds of years, people thought, collisions were the only singularities in Newtonian gravity. Easy to avoid, so not a problem. Now in this paper, they prove, that there are other, non-collission singularities and give an explicit example.
The arrangement in the picture has the middle mass going back and forth between the two binaries faster and faster and it reaches infinite speed in finite time. It basically leaves the universe, like a glitch in a video game. Also the reverse is allowed too: you just need the four masses from the two binary systems and there is nothing in Newtonian gravity that says a fifth mass can’t randomly appear from out of nowhere with infinite speed, slow down and settle between the too binaries.
Since only five masses were necessary to create this problematic constellation, it’s likely that there are many more possible.
Luckily, we have Einsteins theory of gravity now, so don’t have to worry about Newton too much. However, this does have its own, completely different kind of singularity, where the curvature of spacetime goes to infinity. People initially thought, that would be a problematic, unphysical behavior, like Newtons singularities, but it turns out that’s just a real thing that happens: black holes. Here the annoying singularities are mercifully shrouded in an event horizon, so at least we don’t have to look at them. Unless… But there is a solution for that too.
Maybe? Not sure actually. But if it’s about learning the language, here are a few decent ones:
jugendinfo has short articles on many topics with easy language for a young, leftist target audience. Not sure who’s behind it, some Kurdish group probably. Lots of short daily news on various social media, only few select articles on the linked website.
Activism Munich news, interviews and also lots of German translations from English sources. Anti-Imperialist. Also on YouTube and other social media.
world socialist website it’s a trotskyist newspaper. But still decent takes on many issues.
Junge Welt leftist daily newspaper.
Meinungsfreiheit Palästina pro Palestine news on different social media
Medico International a non profit for humanitarian aid, that also publishes a short monthly magazine. Surprisingly good articles sometimes.
Careful if you search for leftist news sites on your own: many supposedly leftist ones are “Antideutsch” meaning zionist, imperialist, pro NATO, pro Genocide.