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Oct
7
reviewed Reviewed Can we (theoretically) spin the black hole so strong that it will be broken apart by centrifugal force?
Oct
7
comment Can we (theoretically) spin the black hole so strong that it will be broken apart by centrifugal force?
This looks Newtonian. Did you consider the curvature of spacetime near a Black Hole? See also "Kerr solution" for Black Holes.
Oct
7
reviewed Approve suggested edit on Could light be dark matter?
Oct
7
reviewed Approve suggested edit on Can we (theoretically) spin the black hole so strong that it will be broken apart by centrifugal force?
Oct
6
comment Matter and Antimatter Interaction in the early Universe
Thus far, no indication for anti-stars have been found, although detectors have looked for atomic anti-nuclei in cosmic rays. But it has been considered, that antimatter may form temporarily on some neutron stars. After contact with matter, antimatter is annihilated in a gamma flash, "eating" matter. Antimatter forms from high-energy gamma rays hitting matter. Due to the usual presence of matter this antimatter will be short-lived. But one cannot rule out, that it can escape sometimes, and live until an encounter with matter.
Oct
6
answered Matter and Antimatter Interaction in the early Universe
Oct
6
reviewed Approve suggested edit on What scientific evidence is there to support or refute the Iron Sun Hypothesis?
Oct
6
answered Apocalypse on earth
Sep
30
awarded  Explainer
Jun
14
reviewed Close Why one cannot escape from a black hole
Jun
14
reviewed Reject suggested edit on Do stars have exactly sphere shape?
May
15
comment Does matter accumulate just outside the event horizon of a black hole?
@StanLiou Great, thanks!
May
15
answered Which is the most early type star with a planet discovered by radial velocity method?
May
15
comment Does matter accumulate just outside the event horizon of a black hole?
@Jonathan One way of thinking may be, that the information of the matter is stored at the event horizon, some fluid-simulations indicate a fractal structure of the event horizon due to infalling matter; this might be a way to overcome the information paradox. That's neither the Schwarzschild nor the Kerr solution.
May
15
comment Does matter accumulate just outside the event horizon of a black hole?
@StanLiou How can the finite life-time of the Black hole due to Hawking radiation be made consistant with the infinite amount of time (future) needed for the expansion of the event horizon (in the outer time-frame)?
May
15
comment Does matter accumulate just outside the event horizon of a black hole?
@Jonathan If you assume e.g. the Schwarzschild solution, the simplest form of a black hole, from an outside observer you need to distinguish three zones: the space-like, the light-like, and the time-like zone. The light-like zone corresponds to the event horizon. If you transform properties of matter between these zones they change their physical properties so much, that the term "the matter is" doesn't make much sense, neither "matter" nor "is". One space dimension changes roles with time.
May
15
answered Does matter accumulate just outside the event horizon of a black hole?
May
15
comment How many earths fit in the observable universe?
@RobertCartaino That's why I just provided two valid digits; so the numbers should be valid more or less next week, too. ;) Btw. sorry for pressing Earth into a cube, next time I'll be more careful.
May
15
comment Does matter accumulate just outside the event horizon of a black hole?
My personal opinion: That's the reason (together with Hawking radiation making the BH vanishing over finite time, as seen from outside), why an event horizon never can form. But that's not (yet?) the main-stream opinion.
May
14
answered How many black holes exist?