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Author Topic: Space Thread  (Read 136849 times)

Il Palazzo

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Re: Space Thread
« Reply #2940 on: April 10, 2019, 11:55:48 am »

The shadow as it's used here has been defined precisely, though. It's the lensed image of the event horizon, approx. 2.5 times larger in angular diameter than the actual thing.
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LordBaal

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Re: Space Thread
« Reply #2941 on: April 10, 2019, 12:03:58 pm »

Did they found Bowman already?
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I'm curious as to how a tank would evolve. Would it climb out of the primordial ooze wiggling it's track-nubs, feeding on smaller jeeps before crawling onto the shore having evolved proper treds?
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Starver

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Re: Space Thread
« Reply #2942 on: April 10, 2019, 12:35:49 pm »

This somewhat represents (from middle to one edge only, obviously you mirror for the other edge) where what you think you're looking at actually may be (somewhere along the 'parallel' path you choose, which might intersect with other such paths).


Bowman is in his hotel-room, watching TV.
« Last Edit: April 10, 2019, 12:37:31 pm by Starver »
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Max™

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Re: Space Thread
« Reply #2943 on: April 10, 2019, 03:09:36 pm »

Remember also that this is a 6 Gigasun object which has been horking down material long enough to hurl a jet of matter across thousands of light years, so the background glow around the shadow is matter screaming as it grinds together while whipping around an orbit wider than that of Neptune and it's doing it fast enough that you can see variations in the images they took, so we're talking fully out in deep relativistic effects land, super high percent of the speed of light type shit.
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Bumber

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Re: Space Thread
« Reply #2944 on: April 10, 2019, 05:43:36 pm »

matter screaming as it grinds together
( ͡° ͜ʖ ͡°)
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Reading his name would trigger it. Thinking of him would trigger it. No other circumstances would trigger it- it was strictly related to the concept of Bill Clinton entering the conscious mind.

THE xTROLL FUR SOCKx RUSE WAS A........... DISTACTION        the carp HAVE the wagon

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Starver

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Re: Space Thread
« Reply #2945 on: April 11, 2019, 05:12:06 pm »

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Kagus

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Re: Space Thread
« Reply #2946 on: April 13, 2019, 09:03:32 am »

*brings back vivid KSP memories*
Bere-sheeit...

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Starver

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Re: Space Thread
« Reply #2947 on: April 14, 2019, 07:41:47 am »

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Akura

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Re: Space Thread
« Reply #2948 on: April 14, 2019, 08:15:26 am »

On the same subject, almost... KSP plane - make it bigger, loads of engines, a lot of wing, and don't forget the wheels.

That looks like they welded two planes together at the wingtip.
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wierd

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Re: Space Thread
« Reply #2949 on: May 01, 2019, 03:47:59 am »

My hokum senses are tingling!!

https://www.livescience.com/65344-quantum-vacuum-gamma-rays.html

Faster than light charged particles?  MASSIVE particles!?  No no no no no no.

Oh, what's that? Local spacetime is distorted so that photons cant travel at the same speed?  But that is still the local spacetime medium, not a photon exchange medium! How?  What?
« Last Edit: May 01, 2019, 03:50:17 am by wierd »
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Kagus

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Re: Space Thread
« Reply #2950 on: May 01, 2019, 05:23:05 am »

Aren't particles by definition massive? It's not much mass, but I thought particles were the ones with the physical bits.


Then again, I am utterly without an education, so I probably shouldn't be talking.

wierd

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Re: Space Thread
« Reply #2951 on: May 01, 2019, 05:48:27 am »

Photon is a point particle (that can also behave as a wave, but meh) that is massless. 
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Arx

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Re: Space Thread
« Reply #2952 on: May 01, 2019, 08:04:41 am »

Oh, what's that? Local spacetime is distorted so that photons cant travel at the same speed?

I am the first to admit I'm not a quantum physicist, nor did I especially enjoy my quantum-adjacent courses, but I've read through the paper and I'm pretty sure that's never claimed. What is claimed is that strong magnetic fields polarise quantum fluctuations (not new), that polarisation causes an effect on protons similar to that of a dielectric medium (i.e. reduction of phase velocity) (not new), and that as a result it seems reasonable to claim that a charged particle in a vacuum can, supposing it is within a powerful enough magnetic field, emit Cherenkov radiation the way one would expect in a dielectric medium (a completely logical follow-on to the previous statements).

Nowhere does it posit that c is exceeded, nor that this really changes anything other than presenting a potential explanation for some currently murky astronomical gamma ray emissions. Especially, the result you seem to be taking particular offense to (light in a vacuum behaving as though in a dielectric medium) seems, although I could be wrong here because I'm reading papers I barely understand, to be decades old:

Quote from: Markland and Shukla, 2006
It has  been suggested  that the nontrivial refractive  index  due  to  photon–photon  scattering could induce a lensing effect in the neighbourhood of a magnetar (Shaviv et al., 1999).

The general interactions between photons and nonlinear QED effects in vacuums have been researched since the 70s or before, too.

I'm sure if I hunted more I could find older results or understand the topic better, but like I said, I don't particularly care for quantum.

Oh, and as for

How?  What?

The paper is on arxiv and presumably, to a physicist in the field, explains those quite adequately.
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