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(Science Alert)   Astronomers discover star whizzing around vast black hole at about 2.5 times the distance between Earth and the Moon, and only takes half an hour to complete one orbit   ( sciencealert.com) divider line
    More: Cool, white dwarf, Star, black hole, Supernova, white dwarf stars, now-lighter white dwarf, vast black hole, Stellar classification  
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1232 clicks; posted to Geek » on 15 Mar 2017 at 2:50 PM (31 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



41 Comments     (+0 »)
 
View Voting Results: Smartest and Funniest
 
2017-03-15 01:46:50 PM  
Turns out the whole accretion disk is vomit from a ship full of hairdressers and telephone sanitizers.
 
2017-03-15 02:13:31 PM  
AKA: circling the drain
 
2017-03-15 02:14:37 PM  
2.5x28x3683kph=1% of the speed of light? Their perspective, I don't see it. Or their math.
 
2017-03-15 02:15:34 PM  
That thing is hauling some stellar ass.
 
2017-03-15 02:20:13 PM  
If I've done the sums right, they're falling towards each other at about 480g.

I can't see how a gaseous or rocky planet wouldn't be ripped apart by the tidal forces. A solid metal planet should be dense enough to hold itself together.
 
2017-03-15 02:24:47 PM  

PreMortem: 2.5x28x3683kph=1% of the speed of light? Their perspective, I don't see it. Or their math.


6 million mile orbit in half an hour = 12 million mph. Speed of light is 671 million mph.

Metric, I laugh at your garlicky units.
 
2017-03-15 02:30:04 PM  

Curate's Keg: If I've done the sums right, they're falling towards each other at about 480g.

I can't see how a gaseous or rocky planet wouldn't be ripped apart by the tidal forces. A solid metal planet should be dense enough to hold itself together.


so maybe it's a dyson sphere!  :D
 
2017-03-15 02:55:37 PM  
img.fark.net
 
2017-03-15 02:56:44 PM  

Grand_Moff_Joseph: Curate's Keg: If I've done the sums right, they're falling towards each other at about 480g.

I can't see how a gaseous or rocky planet wouldn't be ripped apart by the tidal forces. A solid metal planet should be dense enough to hold itself together.

so maybe it's a dyson sphere!  :D


Ring of little rocky asteroids, and a big iron lump that would otherwise be the planet core, if the planet hadn't been ripped apart?
 
2017-03-15 03:03:43 PM  
Yes, but from the perspective of the Star how much time has passed?  It must perceive itself as going around much faster??
 
2017-03-15 03:10:55 PM  

facepalm.jpg: ship full of hairdressers and telephone sanitizers.


img.fark.net
 
2017-03-15 03:23:50 PM  

PreMortem: 2.5x28x3683kph=1% of the speed of light? Their perspective, I don't see it. Or their math.


What now? I don't see your maths, your equation is meaningless.

Distance traveled = 2.5 times the distance of the earth to the moon squared x two x pi = (2.5x385km)^2x2x3.14 => 5.8x10^6 Km

Time taken = 0.5 hours

Speed = 5.8x10^6 x 2 => 1.16x10^7km/h
Speed of light = 1.08x10^9 km/h

So yeah it's about 1% the speed of light
 
2017-03-15 03:26:24 PM  
Bathed in radiation would be an understatement.
 
2017-03-15 03:28:45 PM  
Total distance traveled in an hour 12 million KM=12million KM/H or (divide by 3600 seconds in an hour), 3,333 KM/Second

Speed of light is 300,000 KM/Second (rounded).

3,333 Km/s is roughly 1% of 300,000 KM/second.  Math checks out.


sorry if I missed the snark.
 
2017-03-15 03:33:06 PM  
*turns on Matlab*

*generates orbital model of the system to calculate orbital speed*

Oh... the moment has passed
 
2017-03-15 03:34:17 PM  

Swiss Colony: PreMortem: 2.5x28x3683kph=1% of the speed of light? Their perspective, I don't see it. Or their math.

What now? I don't see your maths, your equation is meaningless.

Distance traveled = 2.5 times the distance of the earth to the moon squared x two x pi = (2.5x385km)^2x2x3.14 => 5.8x10^6 Km

Time taken = 0.5 hours

Speed = 5.8x10^6 x 2 => 1.16x10^7km/h
Speed of light = 1.08x10^9 km/h

So yeah it's about 1% the speed of light


I'll take your word for it.
What is that in parsecs?
 
2017-03-15 03:35:17 PM  
Oblig:

img.fark.net
 
2017-03-15 03:36:05 PM  

Herbie555: Oblig:

[img.fark.net image 193x1500]


God, that show was great.
 
2017-03-15 03:42:17 PM  
So its a black hole with a white dwarf trapped in its field... does that make it a white hole?
 
2017-03-15 03:42:29 PM  

Herbie555: Oblig:

[img.fark.net image 193x1500]


Got a bigger image? I can't read that very well.
 
2017-03-15 03:46:20 PM  

Vaginosilicosis: facepalm.jpg: ship full of hairdressers and telephone sanitizers.

[img.fark.net image 380x600]


Not a stroke, just the 'B' Ark
http://www.geoffwilkins.net/fragments/Adams.htm
 
2017-03-15 03:48:30 PM  
I think it's just good form for it to whiz in a hole instead of all over the universe.
 
2017-03-15 03:49:57 PM  

Smoking GNU: Herbie555: Oblig:

[img.fark.net image 193x1500]

Got a bigger image? I can't read that very well.


Sorry, we're moving so fast that spatial dimensions are compressed...
 
2017-03-15 03:50:22 PM  
But instead of a white dwarf ripping apart another star, it now seems to be a black hole stripping the gases from a white dwarf.

Kinky...
 
2017-03-15 04:03:06 PM  
That will make your eyes bug out. Or in.
 
2017-03-15 04:03:55 PM  
darkmayo

So its a black hole with a white dwarf trapped in its field... does that make it a white hole?

Not until the point of climax..
 
2017-03-15 04:04:44 PM  
If you see it from Australia it spins the other way around.
 
2017-03-15 04:05:47 PM  

Swiss Colony: PreMortem: 2.5x28x3683kph=1% of the speed of light? Their perspective, I don't see it. Or their math.

What now? I don't see your maths, your equation is meaningless.

Distance traveled = 2.5 times the distance of the earth to the moon squared x two x pi = (2.5x385km)^2x2x3.14 => 5.8x10^6 Km

Time taken = 0.5 hours

Speed = 5.8x10^6 x 2 => 1.16x10^7km/h
Speed of light = 1.08x10^9 km/h

So yeah it's about 1% the speed of light


Yeah, I landed on 1.12% c.

384400          average earth to moon distance [km]
384400000    earth to moon distance [m]
961000000    2.5 x EtM [m]
6038135980  distance traveled per orbit (assuming circular orbit) [m]
30                  orbital period [minutes]
1800              orbital period [s]
3354519.99   orbital speed [m/s]
3.00E+08       c [m/s]
1.12% c
 Which is actually pretty crazy to think about...
 
2017-03-15 04:17:39 PM  

Curate's Keg: If I've done the sums right, they're falling towards each other at about 480g.

I can't see how a gaseous or rocky planet wouldn't be ripped apart by the tidal forces. A solid metal planet should be dense enough to hold itself together.


It's a white dwarf -- a compact blob of degenerate matter. The only known objects that are denser are neutron stars and black holes.
 
2017-03-15 04:21:21 PM  

Tr0mBoNe: *turns on Matlab*

*generates orbital model of the system to calculate orbital speed*

Oh... the moment has passed


POINTS!  xD
 
2017-03-15 04:32:11 PM  

BKITU: It's a white dwarf -- a compact blob of degenerate matter


Danny Devito?
 
2017-03-15 04:36:23 PM  

Smoking GNU: Herbie555: Oblig:

[img.fark.net image 193x1500]

Got a bigger image? I can't read that very well.


It was bigger - Fark resized it.

Transcript:

Malcolm:  I mean, right now, we're on a planet that spinning at a thousand miles per hour.  And that's just the rotational velocity. We're also travelling around the sun at almost 67,000 miles per hour, and then the whole solar system is hurtling through the galaxy, which is hurtling away from all the other galaxies because the universe is expanding.

Reese: [Clings to arm of sofa in fear]

Dewey: Wheeee!
 
2017-03-15 04:50:30 PM  
Was going to post "Is this the thread that nerds post formulas?"

Nevermind...
 
2017-03-15 04:58:07 PM  

darkmayo: So its a black hole with a white dwarf trapped in its field... does that make it a white hole?


I believe they prefer the term shawty.
 
2017-03-15 05:13:43 PM  
Happy birthday!
Happy birthday!
Happy birthday!
 
2017-03-15 05:19:05 PM  

darkmayo: So its a black hole with a white dwarf trapped in its field... does that make it a white hole?


i.imgur.com
 
2017-03-15 05:22:23 PM  

Random Anonymous Blackmail: darkmayo

So its a black hole with a white dwarf trapped in its field... does that make it a white hole?

Not until the point of climax..


Scientists are monitoring the birth of The Santorum Nebula.
 
2017-03-15 05:54:48 PM  

moike: darkmayo: So its a black hole with a white dwarf trapped in its field... does that make it a white hole?

[i.imgur.com image 274x200]


I bow to your reference making ability.  One of my favorite shows of all time.
 
2017-03-15 06:24:41 PM  

Curate's Keg: I can't see how a gaseous or rocky planet wouldn't be ripped apart by the tidal forces.


Tidal forces manifest as a differential between one point on the body relative to another. The (non-relativistic) gravitational field pulling on the body as a whole can be arbitrarily high.

So, a rough approximation. The distance between the white dwarf and the black hole is about 1,000,000 km. Wiki states that the volume of a white dwarf is comparable to Earth, so for simplicity, let's say that the white dwarf has a diameter of 10,000km. The near side of the white dwarf is therefore about 990,000km from the black hole, whereas the far side is about 1,010,000km away. Force due to gravity is proportional to the square of distance, so after knocking off unnecessary zeros*, the difference between that felt by the far side vs the near side is (1/99)^2 - (1/101)^2, which works out to about one part in 250,000.

Assuming your estimate of 480g at center is reasonable, this would create a pull of ~479.998 g on the far side, vs 480.002 on the near. Strong enough to strip gasses off over the course of millions of years, but no where near powerful enough to rip apart the core of a while dwarf. See also the Roche limit; though those estimates are loaded with context-specific approximations.

*note that to calculate the actual magnitude of either force, those zeros must be kept. Here, I'm only interested in a relative difference
 
2017-03-15 06:34:52 PM  

WelldeadLink: Happy birthday!
Happy birthday!
Happy birthday!


Heh sees what you did there.
 
2017-03-15 07:43:08 PM  

error 303: Swiss Colony: PreMortem: 2.5x28x3683kph=1% of the speed of light? Their perspective, I don't see it. Or their math.

What now? I don't see your maths, your equation is meaningless.

Distance traveled = 2.5 times the distance of the earth to the moon squared x two x pi = (2.5x385km)^2x2x3.14 => 5.8x10^6 Km

Time taken = 0.5 hours

Speed = 5.8x10^6 x 2 => 1.16x10^7km/h
Speed of light = 1.08x10^9 km/h

So yeah it's about 1% the speed of light

Yeah, I landed on 1.12% c.

384400          average earth to moon distance [km]
384400000    earth to moon distance [m]
961000000    2.5 x EtM [m]
6038135980  distance traveled per orbit (assuming circular orbit) [m]
30                  orbital period [minutes]
1800              orbital period [s]
3354519.99   orbital speed [m/s]
3.00E+08       c [m/s]
1.12% c
 Which is actually pretty crazy to think about...


That impressive and all but how many parsecs would the planet take to do the Kessel run. Less than 12 ?
 
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