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Zaphod Beeblebrox's home star gone supernova?

Technomage

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Rear Admiral
The Hitchhikers Guide to the Galaxy may need updating!

The red giant star Betelgeuse in the constellation Orion - famed as the home sun of Hitchhiker's Guide to the Galaxy characters Zaphod Beeblebrox and Ford Prefect - is shrinking rapidly. Astronomers say that it has shrunk by 15 per cent since 1993, by which they mean that it actually did so in the mid 16th century. It may, in fact, already have exploded.

Improbability LINK

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I always knew Orion the Hunter had a bad shoulder from raising his striking arm for all those centuries, but this is ridiculous.

http://www.theregister.co.uk/2009/06/10/betelgeuse_shrinkage/ said:
Fans will be hoping that the recent shrinkage of Zaphod's sun doesn't mean that, in fact, his homeworld was destroyed hundreds of years before Earth's abrupt demolition to allow construction of a hyperspace bypass
:guffaw:


But seriously...
http://www.theregister.co.uk/2009/06/10/betelgeuse_shrinkage/ said:
Betelgeuse, before it shrank, was thought by astro boffins to be so large that if it were placed in the middle of our solar system, Jupiter - out beyond the asteroid belt in reality - would lie inside it. Now it has shrunk by a distance equal to the orbital radius of Venus.
That's some impressive shrinkage. I guess it's all a matter of Total Perspective...

[reaches for the fairy cake]

Here's another report:

http://esciencenews.com/articles/2009/06/09/red.giant.star.betelgeuse.mysteriously.shrinking
 
Wow, that should make an impressive sight in the sky; they don't seem to have any sort of estimate of when it may go critical. Hopefully nobody is living nearby....
 
But seriously...
http://www.theregister.co.uk/2009/06/10/betelgeuse_shrinkage/ said:
Betelgeuse, before it shrank, was thought by astro boffins to be so large that if it were placed in the middle of our solar system, Jupiter - out beyond the asteroid belt in reality - would lie inside it. Now it has shrunk by a distance equal to the orbital radius of Venus.
That's some impressive shrinkage. I guess it's all a matter of Total Perspective...
Sweet zombie Jesus! I've just done a quick calculation so I may well be wrong, but it seems that Betelgeuse has lost 1/3 of its volume in 16 years. :wtf:

And for those who don't know just how big Betelgeuese is: http://www.youtube.com/watch?v=P38ri8vQjRU
 
Even though Betelgeuse is relatively close to us, word is that we should be safe since it's axis isn't pointing at us.
 
Wow, we could see a serious supernova in our lifetime. Maybe in the next ten years.

Wait, what's that you say? Three years? 2012?


OMFG!!
 
But seriously...
http://www.theregister.co.uk/2009/06/10/betelgeuse_shrinkage/ said:
Betelgeuse, before it shrank, was thought by astro boffins to be so large that if it were placed in the middle of our solar system, Jupiter - out beyond the asteroid belt in reality - would lie inside it. Now it has shrunk by a distance equal to the orbital radius of Venus.
That's some impressive shrinkage. I guess it's all a matter of Total Perspective...
Sweet zombie Jesus! I've just done a quick calculation so I may well be wrong, but it seems that Betelgeuse has lost 1/3 of its volume in 16 years. :wtf:

And for those who don't know just how big Betelgeuese is: http://www.youtube.com/watch?v=P38ri8vQjRU

I think there may be some confusion here. It's radius has shrunk by a distance equal to the radius of Venus' orbit. Not to the radius of Venus' orbit. Or roughly a loss of %15 of it's size as the OP stated.
 
But seriously...That's some impressive shrinkage. I guess it's all a matter of Total Perspective...
Sweet zombie Jesus! I've just done a quick calculation so I may well be wrong, but it seems that Betelgeuse has lost 1/3 of its volume in 16 years. :wtf:

And for those who don't know just how big Betelgeuese is: http://www.youtube.com/watch?v=P38ri8vQjRU

I think there may be some confusion here. It's radius has shrunk by a distance equal to the radius of Venus' orbit. Not to the radius of Venus' orbit. Or roughly a loss of %15 of it's size as the OP stated.
Yeah, I realise that, but it still seems to have shrunk by a third.

Jupiter is roughly 5.2 AUs from the sun while Venus is roughly 0.7 AUs so Betelgeuse's new size is roughly 4.5 AUs. The volume of sphere is calculated by 4/3πr³ so its old volume would have been 589AU³ and its new volume should be 382AU³, that's a loss of more than a third.

Can anyone see where I might have gone wrong? :confused:
 
Sweet zombie Jesus! I've just done a quick calculation so I may well be wrong, but it seems that Betelgeuse has lost 1/3 of its volume in 16 years. :wtf:

And for those who don't know just how big Betelgeuese is: http://www.youtube.com/watch?v=P38ri8vQjRU

I think there may be some confusion here. It's radius has shrunk by a distance equal to the radius of Venus' orbit. Not to the radius of Venus' orbit. Or roughly a loss of %15 of it's size as the OP stated.
Yeah, I realise that, but it still seems to have shrunk by a third.

Jupiter is roughly 5.2 AUs from the sun while Venus is roughly 0.7 AUs so Betelgeuse's new size is roughly 4.5 AUs. The volume of sphere is calculated by 4/3πr³ so its old volume would have been 589AU³ and its new volume should be 382AU³, that's a loss of more than a third.

Can anyone see where I might have gone wrong? :confused:

Your math looks right. I think some posters were under the impression that the star was now %15 of it's original size. I was just trying to clear that up.
 
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