phys.org

Jeredin, 9 miesięcy temu do astronomy w Lightest black hole or heaviest neutron star? MeerKAT uncovers a mysterious object in Milky Way

I’ve been studying the range of neutron stars for some time and I feel confident it won’t be too long until much of our evidence and observations will show that black holes, quasars, super massive black holes and the range of other black holes are very likely, more extreme neutron stars - if not quark-like stars or stellar quantum-like objects. For fun, I’ve been also been focusing on colloids, extreme condensates and their quantum/relativistic phases/states; very revealing interactions and emergent properties. Now if we could just better observe zero-point energy…

5714, 9 miesięcy temu

What is zero-point energy?

Jeredin, 9 miesięcy temu

0.Energy.

Gork, 10 miesięcy temu do astronomy w New study shows Small Magellanic Cloud is actually two smaller galaxies

Hmm. So now we should have Small Magellanic Cloud and Small Magellanic Cloud^2

outer_spec, 10 miesięcy temu

Smaller Magellanic Cloud, and Smallest Magellanic Cloud

stelelor, 10 miesięcy temu do astronomy w Titan's 'magic islands' are likely to be honeycombed hydrocarbon icebergs, finds study

Great article, but that “summary” diagram from the original author is garbage lol

kalkulat, 10 miesięcy temu (edited 10 miesięcy temu) do astronomy w Titan's 'magic islands' are likely to be honeycombed hydrocarbon icebergs, finds study

I haven’t seen the evidence of ‘water oceans’ out there that are about more than a few water ‘geysers’ spewing from below the frozen surfaces like our breaths on winter mornings.

Whenever I hear the words ‘water’ or ‘life’ in a message from NASA I think, ‘Hmmm… who stands to gain from this PR?’ (At least telescopes return great pix and -other, visible- evidence.)

elucubra, 10 miesięcy temu do astronomy w ESA's tiny pinhole thruster is ready for production

Nobody expects the Spanish propulsion

TauZero, rok temu do astronomy 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.