Why does replacing the sun with an equal mass black hole not affect the planets’ orbits?

Does the density of mass/energy not affect the way it curves space time? With the various analogies for visualizing space time curvature, it seems like a denser object would curve more sharply

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u/gregfess — 18 hours ago

How are film reels edited?

It’s my understanding that the benefit to shooting in film as opposed to digital allows for greater resolution (among other benefits). But how are the frames edited without degradation or compression of the image? I’d presume if you scan the film reel onto a computer, the scanning process and reprint process would cause degradation or lowering of the resolution of the images.

This question stems from The Odyssey and wondering how Nolan shoots on IMAX film and that film is then shown in 70mm IMAX screens with physical film reels.

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u/gregfess — 28 days ago
▲ 7 r/bleach

After Mugetsu, what happened to Ichigo’s Soul

*I think the title is vague enough to avoid spoilers, please let me know if not.

After mugetsu, he loses all (most?) of his spirit energy. But at that point he’s still in soul form. Does he get zapped back to his body or did Urahara pick him up and take him? Given that he can’t see souls after mugetsu, I’d figure the latter would be bizarre from Ichigo’s perspective.

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u/gregfess — 1 month ago

[BOOKS] Thoughts/Questions after finishing book series

Stipulation on this, this is the first series I’ve listened to all the way thru via audiobook, so it’s very likely that my comments/questions stem from plainly missing things and not being able to re-read passages.

About half way thru the series, I thought the silos had similarities to a 96 well played (in biology, you can use a 96 well plate to test many experiments at once) and thought each silos was a different experiment. I thought this ended up being correct (or close to it) when near the end of book 3 Donald and Thurman were talking about the way the computer chooses who can give birth and who can’t. I thought the computer may have been trying to create a population that had the best genes to survive the onslaught of a mix of good and bad nanos, the way Donald wasn’t able to. But given that Charlotte was able to survive outside, as well all the survivors of silo 18/17, I don’t think that was correct. What was the computer doing with the lottery system then?

So there was a random chapter near the end of dust where Elise was in a cult and got married to an old guy? But then Solo finds Elise (presumably not knowing what he’s seeing anyways) and just takes Elise. Did anything come of that? It seemed very random.

What ended up happening with silo 40-50? Donald made it seem like that people were still alive in there, but Jules and crew don’t follow up on that. I had originally thought (because I watched the tv show first) that the computer had intentionally segregated that portion of the silos off from silo 1 so that when they are free, they basically know nothing about the past as a way to create humanity from scratch.

After Thurman shuts down silo 18, there are people at the top of the silo and at the bottom. When Charlotte is on the radio with Jules, there is a man on the line and he seems pretty chill about everything. But the. You have Jules saying that everyone is dead. I’m confused about what happened with silo 18 because of this. Did the top of silo 18 get pumped with good or bad nanos? I thought the guy on the radio was gonna say something like “everything is fine up here” and then Jules was gonna realize the good nanos were pumped in, but they just don’t follow up with the guy at the top of silo 18.

Overall I thought the series was good, the pacing in places was a bit slow though. And I don’t know if it was the narrater or the actual text, but the women throughout the series seemed to be characterized in a helpless manner. That may be because I was exposed to the show first which has different characterizations though.

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u/gregfess — 1 month ago

Why is 1776 considered the start of the USA and not 1788/1789?

I saw a previous question asking why it was 1776 and not 1783 (when the treaty of Paris was signed) and that answer made sense in that context. But the United States in its current form didn’t exist until the constitution was signed in 1788 and George Washington didn’t take office till 1789. It makes more sense in my head that 1788/1789 would be the start (thus the semiquincentennial would be 2038)

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u/gregfess — 3 months ago

Does R0 of a virus take into account asymptomatic people?

I know there’s no way of knowing who has contracted a virus and is asymptomatic without testing them, but when researchers determine the R0 of a virus (or bacteria I suppose), how do researchers account for that unknown?

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u/gregfess — 3 months ago

I’ve been trying to remember where the following scenario is from but I can’t think of it: someone is using magic or magical thing in a trivial way, possibly for fun or as a toy, and they get yelled at for using it in that way and not appreciating it.

I realize that trope is probably very common, but it’s been bugging me that I can’t remember what I’m thinking of. I’m not sure if it was from a book, movie, or tv show, though I don’t think it’s from a book since I went thru my Goodreads and nothing popped up.

Any help would be appreciated!

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u/gregfess — 3 months ago