Editing Talk:1342: Ancient Stars
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I knew this because Nick Cave's 2013 album *Push The Sky Away* includes the lyrics "Sirius is eight point six light years away / Arcturus is thirty seven / The past is the past and it's here to stay / Wikipedia is heaven". Obviously Randall has been listening to it! ;-) [[Special:Contributions/173.245.53.176|173.245.53.176]] 08:32, 14 March 2014 (UTC) | I knew this because Nick Cave's 2013 album *Push The Sky Away* includes the lyrics "Sirius is eight point six light years away / Arcturus is thirty seven / The past is the past and it's here to stay / Wikipedia is heaven". Obviously Randall has been listening to it! ;-) [[Special:Contributions/173.245.53.176|173.245.53.176]] 08:32, 14 March 2014 (UTC) | ||
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In the comic, the lifespan of stars is also vastly underestimated. A thousand years is nothing when their age is generally counted in millions or billions of years. What is the probability a near-visible star died in the last thousand years and wouldn't that be a major astronomical event? [[User:Ralfoide|Ralfoide]] ([[User talk:Ralfoide|talk]]) 14:21, 14 March 2014 (UTC) | In the comic, the lifespan of stars is also vastly underestimated. A thousand years is nothing when their age is generally counted in millions or billions of years. What is the probability a near-visible star died in the last thousand years and wouldn't that be a major astronomical event? [[User:Ralfoide|Ralfoide]] ([[User talk:Ralfoide|talk]]) 14:21, 14 March 2014 (UTC) | ||
:In the comic, the lifespan of stars isn't even mentioned in passing. The history of supernovae is pretty well documented and goes back nearly 2000 years, so the light from those supernovae is probably not more than 2200 years old...[[Special:Contributions/173.245.56.65|173.245.56.65]] 15:21, 14 March 2014 (UTC) | :In the comic, the lifespan of stars isn't even mentioned in passing. The history of supernovae is pretty well documented and goes back nearly 2000 years, so the light from those supernovae is probably not more than 2200 years old...[[Special:Contributions/173.245.56.65|173.245.56.65]] 15:21, 14 March 2014 (UTC) | ||
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Of course, one could also add the time it takes for the radiation to reach the surface of the star ;) [[Special:Contributions/173.245.53.162|173.245.53.162]] 15:41, 14 March 2014 (UTC) | Of course, one could also add the time it takes for the radiation to reach the surface of the star ;) [[Special:Contributions/173.245.53.162|173.245.53.162]] 15:41, 14 March 2014 (UTC) | ||
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It is true that the energy released at the centre of the star may take millions of years to reach the surface. But it will not be the light we see until it leaves the surface of the star, as light cannot propagate through the plasma of the stars interior. So - no - we could not add this time;-) [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 19:56, 28 March 2014 (UTC) | It is true that the energy released at the centre of the star may take millions of years to reach the surface. But it will not be the light we see until it leaves the surface of the star, as light cannot propagate through the plasma of the stars interior. So - no - we could not add this time;-) [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 19:56, 28 March 2014 (UTC) | ||
− | What will be different about the photons leaving the surface? They're the same, they've just been bouncing about for thousands, not millions with respect to G-type stars, of years. In that sense, it is the light we see and we must add the time. | + | What will be different about the photons leaving the surface? They're the same, they've just been bouncing about for thousands, not millions with respect to G-type stars, of years. In that sense, it is the light we see and we must add the time. |
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