It's a fascinating concept. What a shame it can't happen in the real world.
On 7 December 2013 07:42, John Clark <[email protected]> wrote: > > On Thu, Dec 5, 2013 at 8:11 PM, LizR <[email protected]> wrote: > > > Ah yes I've heard that the gravity at the event horizon can be as weak >> as you like with a suitably large hole - that you might not even realise >> you'd crossed it >> > > Yes. > > > though surely you'd get some optical effects? >> > > If you were falling back first into a Black Hole things that were behind > you would start to look as if they were ahead of you, and as you got very > close to the event horizon all the light from the entire external universe > would be coming to you from a small disk directly in front of you. When you > actually crossed the event horizon (the point of no return) the diameter of > that disk would shrink to zero and you'd be forever cutoff from the > universe you knew. If the Black Hole were large enough you could still be > alive when you crossed the event horizon, although a few seconds later > tidal forces would rip you apart through spaghettification > > > So the Michell star is effectively like a solid version of a black >> hole's event horizon. >> > > It's more than that, at the event horizon of one of Einstein's Black > Holes, even if the gravity was only 1g, you could never escape the Black > Hole and return to Earth no matter how powerful your rocket is; on the > surface of Michell's dark star even if it was a billion g you could escape > if your rocket was powerful enough (assuming a billion g didn't prove > harmful to your health). > > John K Clark > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
