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**CurtisTH** · 07-11-2009, 02:52 AM

The radiation would kill you would it not?

If you're referring to Hawking radiation, the answer is no - it's incredibly low level. However, if you're referring to the X-ray or gamma radiation emitted by the accretion disc that can be found around many black holes, then you'd be alright as long as you kept out of the path of the radiation jets (which are highly directional).

Does anyone know how big a singularity actually is?

By it's very definition, it's point-sized.

Really?! That is very interesting. So if you had like the "right" equipment as an astronaut you could research the hole? :P

But how are you going to escape? :S

What Meaker is saying is that the gradient of the gravitational field at the event horizon of a massive black hole is very gentle - think in terms of geometry: the smaller the circle is, the tighter the circumference is, and vice versa. Hence why the Earth looks flat to us because the radius is huge compared to us. A massive black hole has a very large event horizon radius, the "gravity circumference" is nice and easy-going... so much so, that one could pass through it and feel nothing odd. However, time dilation effects would be extremely noticeable so it's not like you could pass through the event horizon and not be aware of it.

Anyway, once past the horizon, you're stuff - no amount of rocket thrust or velocity will get you back out again.

07-11-2009, 02:52 AM	#26
CurtisTH Join Date Nov 2005 Posts 391 Senior Member	The radiation would kill you would it not? If you're referring to Hawking radiation, the answer is no - it's incredibly low level. However, if you're referring to the X-ray or gamma radiation emitted by the accretion disc that can be found around many black holes, then you'd be alright as long as you kept out of the path of the radiation jets (which are highly directional). Does anyone know how big a singularity actually is? By it's very definition, it's point-sized. Really?! That is very interesting. So if you had like the "right" equipment as an astronaut you could research the hole? :P But how are you going to escape? :S What Meaker is saying is that the gradient of the gravitational field at the event horizon of a massive black hole is very gentle - think in terms of geometry: the smaller the circle is, the tighter the circumference is, and vice versa. Hence why the Earth looks flat to us because the radius is huge compared to us. A massive black hole has a very large event horizon radius, the "gravity circumference" is nice and easy-going... so much so, that one could pass through it and feel nothing odd. However, time dilation effects would be extremely noticeable so it's not like you could pass through the event horizon and not be aware of it. Anyway, once past the horizon, you're stuff - no amount of rocket thrust or velocity will get you back out again.
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