
#73
Aug2203, 03:16 PM

P: 197

See? That's why I hate mathematics. One can have a formula, but not an explanation... no answer to the question "Why?"... 



#74
Aug2203, 03:36 PM

Sci Advisor
P: 2,507

1) A black hole (given enough mass) can have an event horizon where the gravitational pull towards the center of just 1G. 2) I can move outward from a gravitational field of 1G. 3) Nothing can move outward once inside the event hrizon of a black hole. All three of these can be mathematically proven. All three cannot be true. Something is definitely wrong, here. 



#75
Aug2203, 03:40 PM

Sci Advisor
PF Gold
P: 2,226

1) yes, you could
2) No you couldn't because you'd find the energy needed would be infinite. 3) yes. 



#76
Aug2203, 03:52 PM

P: 197

I think LURCH's point is that the Earth has the gravity of one G.
Hmm? 



#77
Aug2203, 03:53 PM

P: 197

Also, given enough mass, a black should have to be able to have a surface gravity of 0.000000001 G, no? Wouldn't I be able to escape that, especially if I had a good spaceship?




#78
Aug2203, 03:54 PM

P: 197

Wouldn't light be able to get away from a point the gravity of which is just 1G...?




#79
Aug2203, 04:20 PM

P: 915





#80
Aug2203, 04:53 PM

Sci Advisor
PF Gold
P: 2,226

Tail, we're talking about an escape velocity that's the speed of light, so no you couldn't.




#81
Aug2203, 07:47 PM

Sci Advisor
P: 2,507

Speaking of the original topic: BTW, does this not also work in reverse? Can it be said that, in the same way, the "outside" member of the pair (the pair near the smaller black hole) experiences a greater drop in gravity's pull for the same distance travelled? And therefore it is more likely to escape. Both are saying the same thing, if I understand the concept as well as I think I do. 



#82
Aug2303, 03:41 AM

P: 197

Thanks, meteor, I finally found the place!



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