$this->bbcode_second_pass_quote('emailking', '
')No offense to you Novus, but that article is a piece of crap. First of all, it clearly succumbs to this fallacy that a black hole sucks everything in that gets close. In fact, a black hole is indistinguishable from a start of the same mass if you are outside the would be star's radius. We don't see other stars suddenly being gobbled up by a black hole (just ones already in progress) in a galaxy with 200 billion stars, so the chances that we would be first is incredible. This black hole could come within the vicinity of the solar system and do little that we would notice. If it came charging right through, it could cause some havoc (eg. throwing asteroids every which way), but that's pretty unlikely. They're taking real scientists' words out of context to make a scary article.
The other piece of nonsense is the contention that if we did get gobbled up we might be Ok if there's a white hole on the other side. Utter nonsense. A black hole the size of a soccer ball would stretch you into spaghetti before you even reached the event horizon!
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Asteroid Collision
Re: Asteroid Collision
by EnergyUnlimited » Sat 25 Nov 2006, 16:14:35
Well, I will add my 2 cents here (I restrained myslf before from that...)
- stellar mass object few meters in diameter would throw planets out of current orbits while passing through Solar System.
- with some HUGE luck it would form binary system with our Sun.
- Prerequisite of speedy "gobbling" would be head on collision.
- Sufficiently fast flying hole could pass through Sun and fly away without much gobbling at all. Nevertheless we would not survive that.
White hole nonsense (and some other comments):
Lets assume that a black hole which you are falling into is of Galaxy mass and therefore you would manage under event horizon.
The "white hole" would be this horizon seen as disc surface from inside (details are a bit more complicated). The longer you are in, the lower diameter of this disc would be. You would NEVER be able to leave through this white hole to outside.
At some point after entering Schwartzchild type black hole you would meet singularity (you would be dead long before that...)
Kerr type (rotating) black hole would be far more interesting. It has 2 "concentric" event horizons. You can cross each only once, but after crossing inner one your time and space coordinates are back to normal and you may (at considerable energy cost) fiddle with a "business part" - singularity a bit.
Bonus is that there is ring shaped singularity inside, more "forgiving", as long as you do not approach it in "equatorial" fashion.
If you go at 90deg, you would see kind of glowing ring, dark inside.
It is filled with negative space. You could fall through it and stay alive (if you went exactly through a centre). What would happen to you?
- Anything. May be you would meet there your Mom...But rather not...
Any black hole would NOT allow you out, but after considerable time you would be "regurigated back" in form of Hawking radiation (and this is still not coming out of hole). Sounds strange?
Last edited by EnergyUnlimited on Sat 25 Nov 2006, 16:33:13, edited 1 time in total.
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Re: Asteroid Collision
by emailking » Sat 25 Nov 2006, 16:29:07
$this->bbcode_second_pass_quote('EnergyUnlimited', '
')- Sufficiently fast flying hole could pass through Sun and fly away without much gobbling at all. Nevertheless we would not survive that.
')- Sufficiently fast flying hole could pass through Sun and fly away without much gobbling at all. Nevertheless we would not survive that.
I think that's accurate. I don't think earth would be flung from the solar system unless it came really close (which is why I restricted to asteroids), but since the biosphere is so delicately balanced to the solar input, a change in our orbit would lead to either extreme (and immediate) global warming or global cooling.
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Re: Asteroid Collision
by eastbay » Sat 25 Nov 2006, 16:30:51
Entertaining film. Clearly quite a bit of effort was put into making it too. But with just a small additional amount of technical advice from an astronomer or astrophysicist it could have been far more realistic.
Another error is that the massive object was on fire as it moved through space 150 million km from the sun.
Another error is that the massive object was on fire as it moved through space 150 million km from the sun.
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Everything is Impermanent. Shakyamuni Buddha
Everything is Impermanent. Shakyamuni Buddha
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