Red giant star Betelgeuse mysteriously shrinking

Come on! Blow up!!!

I would LOVE to see this thing blow up. It wouldn't really affect life on Earth much, except that it would outshine the Moon and be visible during the day for a month or so... it sure would be a spectacular sight to see.
 
Come on! Blow up!!!

I would LOVE to see this thing blow up. It wouldn't really affect life on Earth much, except that it would outshine the Moon and be visible during the day for a month or so... it sure would be a spectacular sight to see.

It would be pretty bloody awesome to watch. :cheers:
 
You cannot deny it, Anyone who witnesses such an event if it occurs in the future is a lucky soul! Especially in this modern age with all the tools we have now. This will be priceless in value to us all. And I'm certain it's harmless.
 
You cannot deny it, Anyone who witnesses such an event if it occurs in the future is a lucky soul! .
"-What should you do if a nuke goes off near you?"
"-Duck and cover?"
"-No, turn towards it and watch while you can, you will never see anything like it again."
 
The fact that you think it will last only "a few nights" shows that you have no idea how massive the event would be.

i don't think it will last only for a few nights. i just siad that to imply that it isn't gooing to be as dramatic as people think.there's a whole lot of doom and gloom springing up about it already including one guy who claims it will be like a nuclear flash vapourising the entire earth.
 
i don't think it will last only for a few nights. i just siad that to imply that it isn't gooing to be as dramatic as people think.there's a whole lot of doom and gloom springing up about it already including one guy who claims it will be like a nuclear flash vapourising the entire earth.


It won't affect the Earth much. And most of the gamma rays won't be sprayed at Earth either...

But it will be pretty spectacular. Nothing like giving you burns or blindness, but it would shine brighter then the Moon and would be seen during day.



Though in the modern world, just imagine the implications to science... every telescope on Earth and in orbit would be looking at it...
 
i did some back of the envelope calculations(okay, i used open office calc) to work out the energy that earth would recieve and it is only ~600kJ/m^2 in total.

to put this in perspective, this equates to the same energy as 10 minutes of sun. but as mentioned earlier its not going to last for only 10 minutes. perhaps even months.

and this is a assuming that all of the energy goes into light. which it won't. a lot will go into moving the stellar material away from the star.
 
Also, the part where the nova shines very brightly takes a week or two... then it dims out. 600 kJ/m^2? That seems a lot... the Sun is at 1400 kJ/m^2, as we see it from Earth, isn't it?

Could you show us your calculations, please?
 
i did some back of the envelope calculations(okay, i used open office calc) to work out the energy that earth would recieve and it is only ~600kJ/m^2 in total.

Ok, if you mean kJ and not kW it makes sense. but the iradiance in kW would be more interesting to know.
 
i mean kJ. which is why i typed kJ.

no idea what the kW would be as it is going to be variable, rising to a peak and then tapering off. i don't think it will get very high. a peak of a few watts per meter squared maybe.
 
Ah, so a TOTAL energy received would be around 600 kJ/m^2. But yea, over a span of several days, that brings the irradiance down quite low.

Anyone got the number for irradiance of the Moon? That would probably gives us a good estimate for the supernova...
 
the calculation i done was quite simple, i took the energy of a supernova (1.2*10^44J according to wikipedia) and divided it by the surface area of a sphere with a radius equal to the distance from betelgeuse (425ly although there seems to be some debate on this)

this gives a value of 590697.78J/m^2

View attachment supernova.ods.zip

here's the spreadsheet.
 
So, here's a question: does anyone know or think that there has been such a near-Sol event since life has appeared on Earth, or is this likely to be the first time?

I'm just wondering. Many people here seem to think that this will be no big deal, but this isn't like a hurricane or a blizzard which people live through several times in a lifetime and have become used to.

We all tend to think we will likely live to a ripe old age, even though we know that a random event could kill you at any moment. We are almost certain that the human race will outlive each of us almost indefinitely. After all, we've all seen people die, but we've never seen us all go extinct; we have no frame of reference. (We did witness the extinction of the Neanderthal people very recently, but it's not recorded and has slipped from our collective memory.)

But logically speaking, we could be hit by a gama ray burst at any minute and not see it coming, or this particular star could cause very unpredictable things to happen to the Earth, and that would be it. We all die, and the aliens out there staring at the sky wondering who's out here will never hear from us. All of human history becomes irrelevant ( Unless V'ger comes to life).

It doesn't fit our pre-conceived, not to mention quite comfortable, view of our species' role in the scheme of the cosmos, but it's certainly possible.
 
So, here's a question: does anyone know or think that there has been such a near-Sol event since life has appeared on Earth, or is this likely to be the first time?

Well, the end Ordovician extinction may have been a gamma ray burst/hypernova event, although considerably more powerful and further away than Betelgeuse would be.

For a normal supernova, things would be dangerous within 100 ly, but Betelgeuse is further away than that. The EOE, if indeed caused by such an event, involved a directional gamma ray burst from a hypernova about 6000 ly away.

EDIT: Also, I've seen the media talking about a supernova, but I don't think I've seen any scientific articles so far that have been confident enough that a supernova might happen to actually say that it's even a possibility. (Nor have I seen any that flat out denied it as a possibility). But I really, really want to see a supernova. *Prays*
 
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Well, I'd like to see one, too, as long as all I'm doing is seeing it.

I don't want to feel it.

It's far enough away that you shouldn't feel it, but close enough that it should be a very impressive sight.
 
BTW...

mirror-townes.jpg


I'm a little shocked how they are handling the sensitive optics - like if it's the windshield of this guy's car!

Haha, I was just thinking the same thing! :lol:
 
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