Black Hole Suns

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mistermack
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Re: Black Hole Suns

Post by mistermack » Thu Jan 16, 2014 8:28 pm

Mysturji wrote:I think gravitational lensing is EXACTLY what Făkünamę described in the OP.
No, I wouldn't agree. I think there's a superficial similarity.
Făkünamę talked about light that grazes the event horizon of a black hole, but was just far enough out not to be sucked in. That's not gravitational lensing in the normal sense of the term.
A black hole is a tiny object, in space terms. A black hole that is up to fifty solar masses, would be only about 30km across. So the event horizon is tiny. Even one that is a million solar masses wouldn't be much bigger than the Earth.

Gravitational lensing is something that happens over a vast area of space, not around a tiny event horizon.
You just wouldn't get enough light grazing a 30 km sphere to be viewable from millions of light-years away.
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Re: Black Hole Suns

Post by Mysturji » Fri Jan 17, 2014 11:45 am

Scott1328 wrote:Wouldn't the light that approached so close to the even horizon become deeply red shifted?

Gravitational lensing can happen over inter galactic distances and a black hole is not required and certainly wouldn't result in a halo.
I think the question relates to what would happen with a black hole over shorter distances?
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Scott1328
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Re: Black Hole Suns

Post by Scott1328 » Fri Jan 17, 2014 2:31 pm

Mysturji wrote:
Scott1328 wrote:Wouldn't the light that approached so close to the event horizon become deeply red shifted?

Gravitational lensing can happen over inter galactic distances and a black hole is not required and certainly wouldn't result in a halo.
I think the question relates to what would happen with a black hole over shorter distances?

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Re: Black Hole Suns

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