251–260 of 525 posts
Sunspots look black relative to the rest of the sun but are actually very bright. Could this be the same thing? How did they set the black level? Is there a description of the procedure somewhere?
EDIT:
Found the paper describing the data processing: https://iopscience.iop.org/article/10.3847/2041-8213/ab0c57
Earlier quoted context omitted.
The Hawking radiation for a black hole with this mass would be really small. It actually decreases with added mass. So, this observation does not say anything about Hawking radiation.
Shouldn't it increase, just with square of the radius, so it's dwarfed by all the effects that scale with cube of the radius?
Is this what we would see with the naked eye if we were close enough to the black hole? Or would we see nothing, because at this distance we would be dead (or the universe ended all around us)?
It's just a stupid collection of small pixels but somehow it feels very overwhelming looking at it for the first time. What a time to be alive
Burried in that 5 petabytes of data is likely a scan of a much larger field of view at a similar resolution.
Even today, never underestimate the bandwidth of a station wagon full of disks...
It doesn't sound like they just snapped a picture. The one guy says they used "supercomputers" for 6 months to get the image. Sunspots look black relative to the rest of the sun but are actually very bright. Could this be the same thing? How did they set the black level? Is there a description of the procedure somewhere? EDIT: Found the paper describing the data processing: https://iopscience.iop.org/article/10.3847/…
[0] http://people.csail.mit.edu/klbouman/
Earlier quoted context omitted.
The Hawking radiation for a black hole with this mass would be really small. It actually decreases with added mass. So, this observation does not say anything about Hawking radiation.
Shouldn't it increase, just with square of the radius, so it's dwarfed by all the effects that scale with cube of the radius?
Good video that correctly predicted the image and describes why it looks the way it does [1]. TL; DR The dark area is the entire surface of the event horizon, including the side facing away from us, plus some more due to photons missing the event horizon "directly" being drawn in. One side is brighter due to its being Doppler boosted. [1] https://www.youtube.com/watch?v=zUyH3XhpLTo
Wow, the video you posted is even more informative and clear than the actual press conference, and it was created by someone who hadn't even seen the image yet based purely on the mathematical predictions of what we would see. Kind of sad that after all the amazing effort and resources that have gone into the creating the image that the international team couldn't have featured an explanation as clear as this in thei…
https://www.youtube.com/watch?v=S1tFT4smd6E&feature=youtu.be...