What if Sirius exploded?

[thehindmost]

If the light from Sirius exploding just reached Earth now, would the radiation from that hit at the same time, or would it be delayed?

 

[vogon13]

Gamma rays, UV, x-rays, infrared and radio would all travel at the speed of light and arrive simultaneously to the degree they were emitted. If the outer layers, for instance, had to thin out a little to let the gamma rays out they would be delayed, but once electromagnetic radiation is released from the Sirius system, it all gets here in the same amount of time. <br /><br />Neutrinos apparently travel pretty darn close to the speed of light if in fact they don't travel at S.O.L.<br /><br />Cosmic rays will get here pretty close to S.O.L. but some of the other mass possessing particles will take a while. <div class="Discussion_UserSignature"> <p><font color="#ff0000"><strong>TPTB went to Dallas and all I got was Plucked !!</strong></font></p><p><font color="#339966"><strong>So many people, so few recipes !!</strong></font></p><p><font color="#0000ff"><strong>Let's clean up this stinkhole !!</strong></font> </p> </div>

 

[alokmohan]

Sirius is beautiful site and brightest star in sky.History has obviously lot of reference on sirius.In India we call it Lubdhok.In ancient Egypt it was wrongly thought of as cause of flood of nile.Such a character should not explode.I am relieved on hearing it will be there.

 

[Saiph]

Sirius itself can't undergo a supernovae explosion, but it can induce one in it's companion. Type Ia supernovae are the collapse of white dwarfs, caused when they steal to much matter from a nearby star (only a few AU away of course, the other star in the binary). <br /><br />The reason for the collapse is the supporting force of the white dwarf, electron degeneracy pressure, can only support up to 1.4 solar masses. If it's tipped over that scale, it collapses and explodes in a supernova.<br /><br />Of course, I believe the white dwarf is to far from the companion stars to steal the matter, so it's no big deal.<br /><br />As for which form of radiation gets here first, vogon had it right. All forms of light will get here at the same time, unless delayed by part of the explosion process (absorbing materials being opaque basically delaying the escape and emission of a type of light), then Neutrinos, then cosmic rays (several days to weeks later).<br /><br /><br />If there was a supernova at that distance, earth would be pretty blasted and possibly sterilized. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>

 

[robnissen]

Very interesting post. I can't believe amongst the useless knowledge I have acquired, I did not know that the week having 7 days was based on the seven visible planetary bodies. Thx.

 

[alpha_taur1]

- and of course for Northern Germanic based languages, including English, tuesday through friday are based on the Norse deities.<br />English/ Norwegian<br />Tuesday /Tirsdag - Tir or Anglosaxon tiu<br />Wednesday /Onsdag - Odin or Wodin's day<br />Thursday /Thorsdag - Day of Thor<br />Friday /Fredag - Freya's day.<br /><br />Incidentally Lordag or Saturday means 'bath day' in Norwegian. <br /><br />The Greek and Portuguese number their days from Sunday. The Russians number their days as follows:<br /> Monday ponedelnik (After do-nothing) <br />Tuesday - vtornik (Second) <br />Wednesday - sreda (Middle) <br />Thursday - chetverg (Fourth) <br />Friday - pyatnitsa (Fifth) <br />Saturday - subbota (Sabbath)<br />Sunday - voskresenye (Resurrection) <br />

 

[nexium]

I can neither confirm nor denigh most of this. You should not use absolutes such as "no" You should say that significantly harmful radiation will not reach Earth from Sirius. The light we see with our naked eye is radiation.<br /> In the 1995 supernova in the small magenellic cloud, the nuetrinos arrived first, because the super nova began near the center of the star and the rest of the star was transparent to only nuetrinos. If the rest of the star accellerated at two million meters per second (average) away from the center for 1000 seconds = 27 minutes: s =1/2 at squared = one trillion meters = one billion kilometers: The average density of the rest of the star might be low enough for some of the other kinds of radiation to escape after the 1000 th second.<br /><br />After 15 million years = ten half lives of Fe60 the radiation/resedue of Fe60 would be greatly reduced, and undetectable (with present technology) but traces would remain for thousands of half lives. Neil

 

[alokmohan]

Seriously sirius?

 

[silylene old]

<font color="yellow">Seriously sirius?</font><br /><br />you are <i>dogging</i> the question! <img src="/images/icons/wink.gif" /> <div class="Discussion_UserSignature"> <div class="Discussion_UserSignature" align="center"><em><font color="#0000ff">- - - - - - - - - - - - - - - - - - - - - -</font></em> </div><div class="Discussion_UserSignature" align="center"><font color="#0000ff"><em>I really, really, really miss the "first unread post" function.</em></font> </div> </div>