New answers tagged

2 votes

Could black holes be used to warp a laser transmission back to the point of origin?

Yes Light rays that pass close to the black hole get caught and cannot escape. Therefore, the region around the black hole is a dark disk. Light rays that pass a little further away don't get caught ...
JBH's user avatar
  • 120k
7 votes

Do (supermassive) black holes rotate?

Please don't Yes, black holes can spin. Everyone here is confirming that. In fact, a black hole can be entirely described by only three properties, and spin is one of them. But let me kill your joy, ...
The Square-Cube Law's user avatar
9 votes

Do (supermassive) black holes rotate?

Black Holes Must Spin The question is not whether a BH can spin, but rather how you would prevent it from spinning. BHs, like everything else in the universe, must preserve angular momentum. And thus, ...
Lawnmower Man's user avatar
17 votes
Accepted

Do (supermassive) black holes rotate?

Use pulsars instead The Pioneer plaques use pulsars as a universal (or at least galactic) reference (image source) Pulsars are rotating neutron stars that emit radio waves in a "lighthouse" ...
MichaelK's user avatar
  • 43.4k
20 votes

Do (supermassive) black holes rotate?

Yes, supermassive black holes can spin, but your proposal for using their rotation as a timekeeping system isn't ideal. First, the rotation period is likely quite small. The angular speed of a ...
HDE 226868's user avatar
  • 101k
1 vote

Do (supermassive) black holes rotate?

This is actually a really good idea! The great thing about supermassive black holes like A* is that they’re basically impossible to stop - imagine trying to stop our Sun from rotating, and then ...
controlgroup's user avatar
  • 1,856
1 vote

Do (supermassive) black holes rotate?

As you mentioned in the comments you are not limited to using the galaxy spin as time reference so I propose a different solution. Age of the universe as reference In your world numerous wonderful ...
datacube's user avatar
  • 1,805
5 votes

Do (supermassive) black holes rotate?

Rotating black holes are possible. Quoting from the answers to this Astronomy.SE post: A rotating black hole is known as a Kerr Black Hole (named after Roy Kerr who found the numerical solution to GR ...
L.Dutch's user avatar
  • 283k

Top 50 recent answers are included