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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
The article says:
Observing the bright outline that defines the black hole's shadow could serve as an unprecedented test of general relativity, Psaltis said. If the outline is precisely circular, that would be in line with what Einstein's theory predicts. But if the outline turns out to be elliptical, the theory "must be flawed" in some way, he said.
I would think it would always be circular. Why would it be elliptical?
How would define circular if Pi hasn't been numerically determined?
What?!
Pi is an irrational number, which means that it doesn't ever end, and never repeats itself. AKA even if you were given an infinite amount of time, you could not calculate the exact value of pi.
Also, I would think its because black holes might actually spin, and near the poles of the ejection of hydrogen and helium, would bulge in the same way Jupiter does. That's a possibility, but I doubt it because a black hole is infinitely dense, and Jupiter only does that because it spins so fast and that it is made of gas, so centripetal force has a little gain over gravity. So, we'll just have to wait and see the outcome.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
There are other ways of testing if something is circular without knowing pi.
Show it to Homer Simpson, does he mistake it for a doughnut? Compare it to a Lissajous figure on your favourite oscilloscope. Cut it in a lathe and see if the chips come off evenly.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
This is the General Science and Electronics forum and every post has to be on topic.
I would think it would always be circular. Why would it be elliptical?
Why should something that is not understood except by crude approximations and have never been observed have to be round? Maybe it is round in 11 dimensions but not in the 3 we observe? Maybe it has an imaginary component? There are countless ways it may not be round. Round is nice and simple so that is what everyone is betting on.
Registered Member #4362
Joined: Sat Jan 21 2012, 03:44AM
Location: Texas
Posts: 98
Assuming a black hole passed between a light source and our planet I would think it would be two shadows . The light from the source would not all be absorber by the black hole some would be bent around both sides. The shadow would be between the light rays that were bent and the rays that stayed on course. The shadow would most likely be eliptical in my opinion. But its never gonna happen so what diff. does it make.
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Seeing a black hole
