PDA

View Full Version : Super Nova



hosseinrz
2006-Jul-17, 07:16 PM
Hello.
I want to know, how far should be a super nova from earth that will not kill life on earth ?
And what will we see for example a massive supernova occurs in a 20 parsec distance ?

Thanks.
RZ

antoniseb
2006-Jul-17, 07:24 PM
We are not now, nor will we be in your lifetime in any danger from any star close enough to cause trouble.

A bright supernova twenty parsecs from here won't be happening, BUT, it would look like a very very bright point in the sky.

hosseinrz
2006-Jul-17, 07:29 PM
We are not now, nor will we be in your lifetime in any danger from any star close enough to cause trouble.

A bright supernova twenty parsecs from here won't be happening, BUT, it would look like a very very bright point in the sky.

Dear amtoniseb, I know that is not possible and we are not in danger.
I want to know the limit...

-
Does any one think that we have a chance to see betelegeus in super nova ?

ToSeek
2006-Jul-17, 07:38 PM
I Googled for this and found four websites with the answer. Here are the four answers:

30 light years (http://64.233.161.104/search?q=cache:2chg0y46r9MJ:www.astro.uiuc.edu/~bdfields/Talks/Bowdoin06/Fields_Bowdoin2006.ppt+supernova+safe+distance&hl=en&gl=us&ct=clnk&cd=10&client=firefox-a)
50-100light years (http://www.earthsky.com/faqs/index.php?c=ac525eebda&f=135)
160-200 light years (http://www.newscientist.com/article.ns?id=dn2311)
200 light years (http://www.eso.org/outreach/eduoff/edu-prog/catchastar/casreports-2004/rep-310/)

ToSeek
2006-Jul-17, 07:38 PM
I Googled for this and found four websites with the answer. Here are the four answers:

30 light years (http://64.233.161.104/search?q=cache:2chg0y46r9MJ:www.astro.uiuc.edu/~bdfields/Talks/Bowdoin06/Fields_Bowdoin2006.ppt+supernova+safe+distance&hl=en&gl=us&ct=clnk&cd=10&client=firefox-a)
50-100light years (http://www.earthsky.com/faqs/index.php?c=ac525eebda&f=135)
160-200 light years (http://www.newscientist.com/article.ns?id=dn2311)
200 light years (http://www.eso.org/outreach/eduoff/edu-prog/catchastar/casreports-2004/rep-310/)

Tim Thompson
2006-Jul-18, 02:49 PM
The most detailed examination of the question on the web, that I know of, is this one: Will a Nearby Supernova Endanger Life on Earth? (http://www.tass-survey.org/richmond/answers/snrisks.txt).

Conclusion: I suspect that a type II explosion must be within a few parsecs of the Earth, certainly less than 10 pc (33 light years), to pose a danger to life on Earth. I suspect that a type Ia explosion, due to the larger amount of high-energy radiation, could be several times farther away. My guess is that the X-ray and gamma-ray radiation are the most important at large distances.

If we are lucky, there will be no practical demonstrations anytime soon.