Recent comments in /f/space

Quints_Boat t1_j28gttf wrote

Education isn't the limiting factor, it's the massive retooling and change in standards that would be needed across many industries. Not to mention also the need to then ensure interchangeable parts between measurement standards (think housing materials, for example), which could mean increased inventory which is a financial burden for companies.

Unfortunately, the impact is astronomically huge and the imperial measurement system is too ingrained for it to change and make financial sense.

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LookingForDialga t1_j28azpq wrote

My first guess would be that they will be able to see each other because light doesn't need to follow a radial geodesic.

The only way to make sure is to write Schwarzschild metric, find the path of the two falling observers (you can assume radial geodesic) and then find all the possible null geodesics that cross a point of the trajectory of observer 1 and see if any of them also crosses the trajectory of the other observer.

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antiiltal t1_j28aizn wrote

So is there a real alternative to Penrose explanation? I guess the current scientific empirical truth is just that everything started from the big bang and nothing was before that, because before that nothing cannot be confirmed empirically or mathematically. So they just leave it be.

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s1ngular1ty2 t1_j288lmn wrote

You can't see them, no paths for light lead to them. All paths lead to the center. Light can not go from them to you or vise versa. The only light you can see is from where you came from.

You'd see something like this.

https://www.youtube.com/watch?v=HuCJ8s_xMnI

Note, all real black holes spin and drag space with them in a tremendous vortex of warped space time like you see in this video.

Also all the light you see is from the accretion disk being bent around the black hole into your eyes from all sides of the black hole. The light you see may look strange but it is accurate and from the accretion disk. You see it everywhere because of how the space is warped near the black hole. Light from all sides of the black hole can reach you because of the warped space.

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