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Spaceships and astronomy

Spaceships and astronomy

Old Sep 2nd 2020, 9:09 pm
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Default Re: Spaceships and astronomy

Originally Posted by steveq View Post
Except this isn't the first observation, and the observed facts fit existing theories. If you are versed in the physics, this is, yes, its tapping for the very edges of our ability to make measurements, but LIGO now is already much more sensitive than the original LIGO of a couple of years ago. Its still not at the theoretical performance limit
After the black hole impact, wouldn't there be multiple, long frequency waves? In other words, after the initial detection last year, would we not get further detections as the holes merge? Or they merge as kind of a pop ?
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Old Sep 2nd 2020, 9:23 pm
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Default Re: Spaceships and astronomy

No, the waves are emitted as large masses rotate very rapidly in the final moments, then, once the merger has happened, the motion ceases. Yes, theoretically there will be some disturbance, but the current instruments have a limited band of frequencies they can actually detect.


Here you can HEAR the result of the collision. Bear in mind, these are things 50x more massive than the sun, rotating at hundreds of times a second, just before the collision, and they get faster and faster until they merge

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Old Sep 2nd 2020, 9:30 pm
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Default Re: Spaceships and astronomy

Originally Posted by steveq View Post
No, the waves are emitted as large masses rotate very rapidly in the final moments, then, once the merger has happened, the motion ceases. Yes, theoretically there will be some disturbance, but the current instruments have a limited band of frequencies they can actually detect.

https://www.youtube.com/6watch?v=JKBBVgR991s

Here you can HEAR the result of the collision. Bear in mind, these are things 50x more massive than the sun, rotating at hundreds of times a second, just before the collision, and they get faster and faster until they merge
So that blip we hear on the model, how much time does it represent? Presumably the merger and resulting disturbance was not just the split second that we hear on the audio?
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Old Sep 2nd 2020, 9:45 pm
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Default Re: Spaceships and astronomy

Originally Posted by Shard View Post
Or they merge as kind of a pop ?
Yeah, it happens that quickly. When your mass is 140 times the mass of the sun there is a lot of gravity involved that makes things happen very quickly
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Old Sep 2nd 2020, 10:13 pm
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Default Re: Spaceships and astronomy

Originally Posted by Shard View Post
So that blip we hear on the model, how much time does it represent?
The unmodified version of what is detected is the first sample in the little video, it really only lasts for a second or two. The detector can't "hear" signals below about 30Hz, which is a very deep tone for us, and likewise it can't hear above about 7kHz. So these two massive objects spin around each other at less than 20 times a second, we can't hear them, and if they go more than 10,000 times per second we can't hear them either.....
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Old Sep 2nd 2020, 10:21 pm
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Default Re: Spaceships and astronomy

I have had the very great honour of talking with and shaking the hand of Professor Barry Barish, co winner of the Nobel for Ligo.
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Old Sep 2nd 2020, 10:27 pm
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Default Re: Spaceships and astronomy

Originally Posted by Pulaski View Post
Yeah, it happens that quickly. When your mass is 140 times the mass of the sun there is a lot of gravity involved that makes things happen very quickly
Difficult for my primitive ape brain to comprehend, but perhaps that's the case. I suppose the whole universe did start in less than an instant.
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Old Sep 2nd 2020, 10:31 pm
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Default Re: Spaceships and astronomy

Originally Posted by steveq View Post
I have had the very great honour of talking with and shaking the hand of Professor Barry Barish, co winner of the Nobel for Ligo.
​​​​​​It's always great to meet those whom you admire.
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Old Sep 2nd 2020, 10:42 pm
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Default Re: Spaceships and astronomy

Originally Posted by Shard View Post
Difficult for my primitive ape brain to comprehend,
Hmmm. [Mulling over previous exchange.]
but perhaps that's the case. I suppose the whole universe did start in less than an instant.
Well bear in mind that the black hole has all its mass concentrated at a singularity (point of zero volume), so its not like the two event horizons are in any way representative of an amount of matter that needs to merge.

The event horizon of the black hole is just a "light vacuum" (volume of space from which light cannot escape). So a black hole of 70 solar masses would have an event horizon diamter of about 250 miles, but two black holes of that size (of event horizon) will merge in the blink of an eye as the two singularities merge.
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Old Sep 2nd 2020, 11:58 pm
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Default Re: Spaceships and astronomy

Originally Posted by Pulaski View Post
Hmmm. [[i]Mulling over previous exchange.]

Well bear in mind that the black hole has all its mass concentrated at a singularity (point of zero volume), so its not like the two event horizons are in any way representative of an amount of matter that needs to merge.

The event horizon of the black hole is just a "light vacuum" (volume of space from which light cannot escape). So a black hole of 70 solar masses would have an event horizon diamter of about 250 miles, but two black holes of that size (of event horizon) will merge in the blink of an eye as the two singularities merge.
That's a very good point. (The second one.)
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Old Oct 2nd 2020, 5:53 pm
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Default Re: Spaceships and astronomy

Nasa go catches up with the fact that women have different plumbing: https://www.bbc.com/news/world-us-canada-54387288
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Old Oct 2nd 2020, 5:59 pm
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Default Re: Spaceships and astronomy

Originally Posted by lizzyq View Post
Nasa go catches up with the fact that women have different plumbing: https://www.bbc.com/news/world-us-canada-54387288
No, the current system was unisex, the new system is just better. It has a tighter seal to the parts that matter.
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Old Oct 4th 2020, 11:04 pm
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Default Re: Spaceships and astronomy

Originally Posted by steveq View Post
No, the current system was unisex, the new system is just better. It has a tighter seal to the parts that matter.
So NASA spent $23million on a better gasket?
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