astronomy

TauZero, rok temu w Black holes could come in 'perfect pairs' in an ever expanding universe

Oh! They don’t mean that black holes must come in perfect pairs! The headline makes it sound like it’s about wormholes across vast distances. No! What they’ve found is a stable “orbit” solution for the two-body problem. Normally when you place two bodies anywhere in an empty universe, they will gravitate towards each other until they collide. But in a universe with dark energy, there is some perfect distance between them, where the accelerating expansion perfectly counterbalances the accelerating attraction. They’ve used general relativity math to actually calculate such an arrangement.

The “stable” orbit in this case is the same kind of stable as a pencil balanced on its sharp tip - if it tilts even slightly one way it will fall out of control. Although they tantalize the idea that they might be able to make it truly stable against small perturbations once they finish their spinning black hole solution.

I would like to have known some specific numbers examples! Like if you have as much dark energy as our universe, and two 10-solar-masses stellar black holes, how far apart would that be? Is it like 1Ly or 1MLy? How far for two 10-million-solar masses supermassive black holes? The formulas they created should give the exact answer but I am not skilled enough to substitute the correct numbers for the letters.

TauZero, rok temu w City-size comet racing toward Earth regrows 'horns' after massive volcanic eruption

What a disgusting clickbait title 🤮. The comet is not “racing towards Earth” any more than say Mars is (and Mars comes closer to Earth than this comet will). Maybe some day we’ll live in a world where journalists do not sensationalize headlines with a mix of Deep Impact and The Ninth Gate, but today is not that day.

outstanding_bond, rok temu

On Mander, fighting the clickbait pop science menace is every citizen’s duty. Are you doing your part?

blackbrook, rok temu

I think they are. I checked the comments before clicking on the article and that comment prevented me from rewarding that clickbaiter.

TauZero, rok temu

The poster is just submitting the article as titled, and the scientists are just making cool observations not bothering anyone. The fault for clickbait lies solely with the journalists/editors. I wish instead of continuing the practice from that other site of “submission title must match article title”, we normalize the culture of writing our own plain language de-clickbait-ified titles, the way HackerNews does it.