Jillian's Guide to Black Holes: Forming - Types - Outside - Inside - Finding - References - Websites

If we can't see it, then we can't find out anything about 'em?

Psssh! It may be black, but it's not completely hidden! We can tell the size of the event horizon (the black hole's "mass"), whether it's charged or not, and whether it's spinning and at what rate. Remember that a star can collapse to form a black hole? All information about what the star is made of is lost. The star could have been made of antimatter or matter, and it wouldn't make a difference in the resulting black hole. We can't peer past the event horizon to see the singularity...even if we could, the singularity is a damn strange place. If the collapsing star were not quite spherical, those deviations were burned off during the collapse (gravitational waves? what?), so all black holes have the same general shape. What differs from hole to hole is the mass, charge, and angular velocity.

Static (a Schwarzschild black hole)

(green circle: for black hole beginners)
Covering such diverse topics as...

Charged (a Reissner-Nordstrøm black hole)

(blue square: for intermediate black hole fans)
Running the gamut of curiosities such as...

Rotating (a Kerr black hole)

(black diamond: for black hole experts)
Introducing eclectic ideas such as...

 

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