There's other kinds of matter.
I'm pretty sure the singularity is considered to be at the center of the black hole, not the black hole itself.
It can also be shown that the singular region contains all the mass of the black hole solution.
56. Carroll, Sean M. (2004). Spacetime and Geometry. Addison Wesley. ISBN 0-8053-8732-3, the lecture notes on which the book was based are available for free from Sean Carroll's website
@delmoi - been a long time since I read about black holes, but I don't see how a black hole can be exorbitantly large and also collapsed into a single point. I'm pretty sure the singularity is considered to be at the center of the black hole, not the black hole itself.
Nope, there's definitely a point at the center. But we can't really observe that, the only observables are mass-energy, position, angular momentum, velocity and charge.
So it wouldn't be too odd for science journalism to use speed-of-light phrasing for a near-extremal black hole.
I guess the guardian author just decided to add some nonsense?
delmoi: Obviously black holes themselves are a type of dark matter.
The new black hole debate is over firewalls.
The black hole that is spinning so very fast is unusual in its rotation.
The infalling object has some apparent temperature, and the horizon is a different object with a different apparent temperature.
"Dark matter" isn't called merely that because it doesn't radiate light, but because it doesn't seem to interact with "normal" matter in any observable way except gravitationally.
« Older Surrey Satellite Technology's STRaND 1 demonstrate... | The food documentary is a ripe... Newer »
This thread has been archived and is closed to new comments
Buy a Shirt