| |
 |
|
|
Science Forum Index » Astro - Amateur Forum » Pretty stupid question - black holes
Page 1 of 1
|
| Author |
Message |
| Eugene Griessel |
 Posted: Mon Feb 19, 2007 8:13 am |
|
|
|
Guest
|
I was watching the BBC program "Space" with Sam Neill this morning.
One of my least favourite programs because it seems to have been made
to excite and tittilate the ignorant rather than inform the knowledge
seeker. IMHO it's a curate's egg with lots of cruddy gee-whizz
graphics interspersed with brief bits of genuine science.
In episode 3 we are regaled with the breathless tale of "monsters"
that could consume the earth - black holes. Including a scenario of
what would happen to the solar system should one of these take it into
its head to devour us.
Having recently discussed black hole/earth encounters, I was wondering
if anyone would care to comment on this particular depiction - and
how close it would be to what scientific thought holds for such an
encounter. Personally I think it sucks - but that is a complete
tailbone feeling, having nothing to do with either scientific thought
or logical analysis.
Eugene L Griessel
Art is what you can get away with. You didn't get away with it. It's not
art. -- Squid |
|
|
| Back to top |
|
| Chris L Peterson |
| Posted: Mon Feb 19, 2007 10:56 am |
|
|
|
Guest
|
On Mon, 19 Feb 2007 12:13:54 GMT, eugene@dynagen..co..za (Eugene
Griessel) wrote:
Quote: In episode 3 we are regaled with the breathless tale of "monsters"
that could consume the earth - black holes. Including a scenario of
what would happen to the solar system should one of these take it into
its head to devour us.
There are a number of gravitational simulators out there you can
download and play with. It's fun and instructional to allow a rogue star
to fly through the Solar System. The results are almost always the same:
a few planets are captured by the intruder, and end up orbiting it, a
few remain around the Sun, although usually with altered orbits, and a
few are flung out of orbit completely. It makes no difference whether
you consider the rogue object a star or a black hole- the dynamics are
essentially the same. Nothing gets "devoured", barring the extremely
unlikely chance of an actual collision, but the Solar System certainly
doesn't come out of such an event intact.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com |
|
|
| Back to top |
|
| Starlord |
| Posted: Mon Feb 19, 2007 11:48 am |
|
|
|
Guest
|
Black Holes do suck ;}
--
There are those who believe that life here, began out there, far across the
universe, with tribes of humans, who may have been the forefathers of the
Egyptians, or the Toltecs, or the Mayans. Some believe that they may yet be
brothers of man, who even now fight to survive, somewhere beyond the
heavens.
The Lone Sidewalk Astronomer of Rosamond
Telescope Buyers FAQ
http://home.inreach.com/starlord
Sidewalk Astronomy
www.sidewalkastronomy.info
The Church of Eternity
http://home.inreach.com/starlord/church/Eternity.html
"Eugene Griessel" <eugene@dynagen..co..za> wrote in message
news:45d99288.21031881@news.uunet.co.za...
Quote: I was watching the BBC program "Space" with Sam Neill this morning.
One of my least favourite programs because it seems to have been made
to excite and tittilate the ignorant rather than inform the knowledge
seeker. IMHO it's a curate's egg with lots of cruddy gee-whizz
graphics interspersed with brief bits of genuine science.
In episode 3 we are regaled with the breathless tale of "monsters"
that could consume the earth - black holes. Including a scenario of
what would happen to the solar system should one of these take it into
its head to devour us.
Having recently discussed black hole/earth encounters, I was wondering
if anyone would care to comment on this particular depiction - and
how close it would be to what scientific thought holds for such an
encounter. Personally I think it sucks - but that is a complete
tailbone feeling, having nothing to do with either scientific thought
or logical analysis.
Eugene L Griessel
Art is what you can get away with. You didn't get away with it. It's
not
art. -- Squid |
|
|
| Back to top |
|
| Martin Brown |
| Posted: Mon Feb 19, 2007 12:23 pm |
|
|
|
Guest
|
On Feb 19, 12:13 pm, eugene@dynagen..co..za (Eugene Griessel) wrote:
Quote: I was watching the BBC program "Space" with Sam Neill this morning.
One of my least favourite programs because it seems to have been made
to excite and tittilate the ignorant rather than inform the knowledge
seeker. IMHO it's a curate's egg with lots of cruddy gee-whizz
graphics interspersed with brief bits of genuine science.
Pure special effects Disneyfied science 
Quote:
In episode 3 we are regaled with the breathless tale of "monsters"
that could consume the earth - black holes. Including a scenario of
what would happen to the solar system should one of these take it into
its head to devour us.
ISTR the one in the original "Space" series was about the size of a
pea and behaved exactly like the "bad boy" demented cosmic vacuum
cleaner of science fiction stories by going from planet to planet
gobbling them up and finally off to eat the sun. The reality would be
much different. Short of a direct hit on the Earth we would barely
notice an asteroid mass BH passing through the solar system. And a
solar mass BH (or solar mass anything) would be all too noticable as
it perturbs first the comets and then the planets from their orbits
and would be most disruptive.
Quote:
Having recently discussed black hole/earth encounters, I was wondering
if anyone would care to comment on this particular depiction - and
how close it would be to what scientific thought holds for such an
encounter. Personally I think it sucks - but that is a complete
tailbone feeling, having nothing to do with either scientific thought
or logical analysis.
A rough analysis was done in a thread on sci.physics.relativity when
"Space" first came out.
http://groups.google.com/group/sci.physics.relativity/browse_frm/thread/f49d644410037686/4da7b39c4d0845e1?lnk=st&q=&rnum=1#4da7b39c4d0845e1
Is the start of the thread. Beware of the usual cranks and nutters
posting into it.
The only thing that proved impossible to get a decent handle on was
whether or not an asteroid mass BH with Rs ~ 2um and a mass convertion
explosive yield of about 100MT/s would experience sufficient drag in
the minute or so it took to go through the Earth to lose most of it
velocity and be captured. Eventually for a large enough and/or dense
enough target it must be possible for a BH to be gravitationally
captured, but that proved too hard to analyse.
It was clear that a neutron star would stop a BH pretty easily, but
ordinary matter looked on the face of it too weak.
Regards,
Martin Brown |
|
|
| Back to top |
|
| |
|
Page 1 of 1
All times are GMT - 5 Hours
The time now is Mon Dec 01, 2008 11:47 pm
|
|