Danijel Gorupec

Because as I am falling through the horizon, at one moment my legs are below horizon and my head is above it. Does it mean that my blood cannot circulate any more - the blood from my legs cannot return to my heart? If so, I would definitely notice I crossed the event horizon (disproving the claim 2). Or, my blood can continue to circulate, in which case also the rope can be dipped and removed in/out of event horizon (disproving the claim 1).

I am imagining orbiting a supermassive BH just above its event horizon, then lowering a rope (or better a rod) - it does not have to be a very long rope/rod... I don't understand why I should be dealing with strong forces here?

Long time no chat... I was trying to use AI to help me reconcile the two claims I commonly hear, but without success. Maybe someone here can help me better: claim 1: If you lower a rope below event horizon you are not able to pull it back claim 2: You can cross the event horizon of a supermassive black hole without even noticing. The two seem incompatible to me, but LLMs do not seem to be bothered.

Thanks CharonY, nice answer. One more question: you mentioned large differences in genome sizes even within related eukaryotic species - does it mean that genome size can change in large steps (I suppose this is more likely than series of many small unidirectional steps)?

I hope I don't ask something dumb... Are there studies to check if, on average among species, genome size increased in last tens of millions of years? Would you expect that evolution continuously increases genome sizes, or did we reach some sort of equilibrium already?

To prepare bread dough, I mix flour and water. They say that water hydrates starch and protein molecules in the dough... What this 'hydrating' mean at the molecular level? I am imagining that water molecules make short-lived bounds with large dough molecules (carbohydrates and proteins). If so, does it mean that those bounds (between water and large molecules) are stronger and longer-lived than bounds between water molecules themselves? What is the thickness of this bound water layer - is it one molecule thick? There is also free (unbound / bulk) water in the dough. I imagine there is some sort of equilibrium between bound and unbound water - that is, you cannot have a dough that only has bound (and zero unbound) water? Still, I imagine that in drier doughs, larger proportion of water is bound and smaller proportion is free? Yeast needs water - I guess it lives inside water - is this the free (unbound) water where the yeast lives in? Btw, I am interested in all things dough, so if you have anything else interesting/important to mention, go ahead.

The derivation you are mentioning... is it considering some sort of plane gravitational waves, or more general? As I understand you, you are also talking about near-observer perturbations? Otoh, the array of clocks, I was mentioning, is distributed.

I was indeed interested in weak gravitational waves... I would be surprised if the theory only predicts disturbances in spatial dimensions, and not the time dimension. Because I am under impression that the theory treats space and time on more or leas equal footing. Anyway, I am now thinking about what you said, if gravitational waves indeed can cause only (or predominantly) spatial disturbance, can then there exist a different type of gravitational wave that only (or predominantly) causes time disturbance? @swansont Thinks for the link.

As a gravitational wave passes though a constellation of precise clocks, would it be possible, at least in theory, to detect its passage by measuring time difference between clocks? If so, is it harder to make such measurements than to measure spatial distortions?

Could two or more space shuttles do it - by refueling in the orbit? At least an one-way trip... You park one shuttle in the orbit, and then use other(s) to bring more fuel.

Does it mean they are using gamma ray lasers? Can you see anything in gamma light without destroying it?

If I understand the task correctly... it is to estimate the moon distance on that exact day (it should be somewhere between 362600 and 405400km). You can take the moon and sun diameter (both fixed) from any external source.... The interesting part, imo, would be to estimate the error of your calculation.

I suppose your relative is aware that it is very easy to check if he sourced the answer from the internet. So, he probably did not have an intention to fool you... I guess he would change the wording if he really wanted to deceive.

Did you watch as it was happening? Was it fast or slow? I recently saw a video of some kind of sea slug catching a sleeping fish... by very slowly enveloping the fish in some sort of extendible bag... I was very impressed, but forgot to remember the slug name to learn more about it.