Is the planet from Interstellar impossible?

Well, here comes another black hole question from yours truly. I'm sure everyone is surprised ;)

So I've heard arguments from physicists before, saying that the planet near a blackhole in Interstellar would be unstable, or bathed in lethal radiation from the accretion disk, etc. But it just dawned upon me that it should be flat out impossible for it to be there.

Of course, that's calculated from my position of not understanding most of GR, so I might be wrong. (I know, it surprises me too.;)) If anyone knows better, please do correct me.

So for a Schwarzschild kind of black hole, the time dilation effect in relation to a far far away observer is the square root of (1 - 2GM/rc²). So as you get closer to the Schwarzschild radius, that approaches infinity.

Black holes also have a photon sphere, i.e., a radius under which even photons can't maintain a stable orbit. In the recent photo of a black hole, yeah, that was what the black blob in the middle was. It wasn't the event horizon itself.

That radius, again for a Schwarzschild kinda black hole, is 3GM/c².

Thing is, if you substitute the latter formula into the former, you're still at VERY tame time dilation.

Ok, so at this point I should probably add SR time dilation, since that planet or its star would be orbiting around the star, not hovering in place. And the thing is, we still have some thousands of times worth of time dilation for that to explain. The OVERWHELMING difference in how fast time flows would in fact be from it moving incredibly close to the speed of light, rather than the black hole itself.

I.e., that planet wouldn't be somewhere at the outer edge of the accretion disk. It would be right at the INNER edge of the accretion disk, and at that, quite spaghettified.

So am I wrong there?

Also, obviously I'm not qualified to touch the maths for a ROTATING black hole with a 10 lightyear pole. Which the one in Interstellar probably would be. So if anyone wants to shed light on that one, please help.

Why does YouTube delete its memory of me?

It happens every few months ...

My regular viewing builds up playlists, key words lead to things I've viewed before (plus extras), and there's that whole list of hundreds of regular stuff.

Then it all goes away.

I live in Greece so tonight it was all replaced with Greek music and tv etc etc

I changed location to UK and it presented me with a pile of UK tv clips, music that doesn't interest me etc

ffs

Why?

Could scientists with a great deal of research manufacture helium?

I read where its a by-product of nuclear fission. Could we harvest helium from nuclear power plants?

1 in 5 Police Officers Express Violent Racism Online

SPOTLIGHT: IN A STUDY OF COPS’ FACEBOOK ACCOUNTS, 1 IN 5 HAD POSTED RACIST, VIOLENT CONTENT

Excerpt:

Quote:

The Plain View Project looked at the accounts of about 2,900 current officers and 800 retired officers. Hoerner and Tulsky reported that “the project sought to compile posts, comments, and other public activity that could undermine public trust in the police and reinforce the views of critics, especially in minority communities, that the police are not there to protect them.” The researchers found more than 5,000 posts and comments that met their criteria. Of the officers who could be identified on Facebook, 1 in every 5 of the current officers and 2 in every 5 of the retired officers made comments that met that standard, “typically by displaying bias, applauding violence, scoffing at due process, or using dehumanizing language,” Hoerner and Tulsky wrote.

Yeah, that's not all all surprising, unfortunately, and is a big and glaring nail in the coffin of the "bad apple" theory. 20% of police expressing violent racist attitudes is far from "a few bad apples", that's a systemic, cultural problem. Particularly when you consider that those are only the ones who felt sufficiently comfortable spewing their hate openly and identifiably. Quite clearly, there are many more who hold these sentiments, but aren't dumb enough to air them publicly.

And it's not just the rank and file, either.

Quote:

It wasn’t just the less-experienced or lower-ranked officers who were responsible for the offensive, troubling public posts. Among those identified as members of the Philadelphia police department, at least 64 were in leadership roles, “serving as corporals, sergeants, lieutenants, captains, or inspectors, according to an employment roster from January.”

Nothing that hasn't been known by minorities for many decades; but putting actual numbers on the problem helps to quell the denialism (somewhat, I'm sure the resident cop groupies will be in here shortly with the usual mealy-mouthed evasions and justifications).

17 year old girl euthanized in Netherlands

https://www.news.com.au/lifestyle/pa...66e1b1b8e215a1


Noa Pothoven, 17, has been legally euthanised in the Netherlands, saying the pain she was dealing with after a childhood rape was “insufferable”.



So much for the Hippocratic Oath

Darwin shooting

Sounds nasty

4 dead

https://www.bbc.com/news/world-australia-48510881

Luke Mitchell and the murder of Jodi Jones

"Forensic psychologist Ian Stephen, who advised on the television crime dramas Cracker and Prime Suspect, said that was in itself a clue.

He said: 'The fact he [Mitchell] kept attending school and insisted on trying to maintain as much normality as possible - and his mother insisted on this as well and made a big issue of it - seemed to me almost like a confession of guilt in some way.'" Link.

If you are calm, you are guilty. If you collapse at the funeral, you are guilty....