Editing Talk:811: Starlight

Jump to: navigation, search
Ambox notice.png Please sign your posts with ~~~~

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision Your text
Line 1: Line 1:
 
I thought that was a picture frame, a mirror makes more sense. [[Special:Contributions/184.66.160.91|184.66.160.91]] 08:40, 17 July 2013 (UTC)
 
I thought that was a picture frame, a mirror makes more sense. [[Special:Contributions/184.66.160.91|184.66.160.91]] 08:40, 17 July 2013 (UTC)
  
From the light's point of view, EVERYTHING is in the same place. The whole universe in one point. {{unsigned ip|108.162.238.114}}
+
From the light's point of view, EVERYTHING is in the same place. The whole universe in one point. {{unsigned  
 +
ip|108.162.238.114}}
 
:Actually, I think that the universe would be a solitary plane.  Since light moves only in one straight line. [[Special:Contributions/173.245.54.204|173.245.54.204]] 02:14, 5 March 2015 (UTC)
 
:Actually, I think that the universe would be a solitary plane.  Since light moves only in one straight line. [[Special:Contributions/173.245.54.204|173.245.54.204]] 02:14, 5 March 2015 (UTC)
  
Line 14: Line 15:
 
It's a mirror. Picture frame makes no sense. It's a mirror. -Pennpenn [[Special:Contributions/108.162.250.162|108.162.250.162]] 06:41, 10 August 2015 (UTC)
 
It's a mirror. Picture frame makes no sense. It's a mirror. -Pennpenn [[Special:Contributions/108.162.250.162|108.162.250.162]] 06:41, 10 August 2015 (UTC)
  
This is pushing into areas beyond my expertise, but I question the validity of the assertion that the light particle will experience no time between departing the star and arriving at the planet. From what I understand, One of the pillars of relativity is that from ALL reference frames the speed of light is constant.  So when we discuss things "from the point of view of a light particle" most of what we say is basically conjecture.  It is impossible to have a valid reference frame moving along with a photon. To say that from the photon's point of view no time passes is to assume a reference point where the speed of light is no longer constant, but instead photons have the ability to be stationary.  A stationary photon can never be observed in any valid reference frame.  It is fair to say that a particle traveling at a speed infinitesimally less than the speed of light will experience almost no time between locations, but time dilation follows a curve that is only valid for speeds approaching but not including the speed of light. {{unsigned ip|108.162.238.114}}
+
This is pushing into areas beyond my expertise, but I question the validity of the assertion that the light particle will experience no time between departing the star and arriving at the planet. From what I understand, One of the pillars of relativity is that from ALL reference frames the speed of light is constant.  So when we discuss things "from the point of view of a light particle" most of what we say is basically conjecture.  It is impossible to have a valid reference frame moving along with a photon. To say that from the photon's point of view no time passes is to assume a reference point where the speed of light is no longer constant, but instead photons have the ability to be stationary.  A stationary photon can never be observed in any valid reference frame.  It is fair to say that a particle traveling at a speed infinitesimally less than the speed of light will experience almost no time between locations, but time dilation follows a curve that is only valid for speeds approaching but not including the speed of light.
  
 
---I'm not a physicist, but I'm fairly certain you can have a valid light-speed frame of reference. As I recall, that's part of the explanation for how the weak force can distinguish left-handed particles from right-handed ones. This makes no sense at first blush, because whether a particle is spinning left or right depends upon the position of the viewer. You could have one person observe a left handed particle decay while an observer at a different angle observes a right handed particle do nothing. The answer is that if the particle has no intrinsic mass, all observers would agree that it is traveling at the speed of light, and that there is a well-defined left and right (with respect to the direction of the particle's motion).  This becomes immensely more complicated because it applies to particles that have no intrinsic mass, but nonetheless obtain effective mass through the Higgs mechanism (for instance, leptons). [[Special:Contributions/173.245.56.165|173.245.56.165]] 18:16, 11 September 2015 (UTC) - NotaphysicistbutIplayoneontheinternet
 
---I'm not a physicist, but I'm fairly certain you can have a valid light-speed frame of reference. As I recall, that's part of the explanation for how the weak force can distinguish left-handed particles from right-handed ones. This makes no sense at first blush, because whether a particle is spinning left or right depends upon the position of the viewer. You could have one person observe a left handed particle decay while an observer at a different angle observes a right handed particle do nothing. The answer is that if the particle has no intrinsic mass, all observers would agree that it is traveling at the speed of light, and that there is a well-defined left and right (with respect to the direction of the particle's motion).  This becomes immensely more complicated because it applies to particles that have no intrinsic mass, but nonetheless obtain effective mass through the Higgs mechanism (for instance, leptons). [[Special:Contributions/173.245.56.165|173.245.56.165]] 18:16, 11 September 2015 (UTC) - NotaphysicistbutIplayoneontheinternet
Line 25: Line 26:
 
I got the impression that Beret Guy wasn't trying to return the light itself back to the stars, but give the stars the same pretty image they get on Earth by "looking" at the mirror. Seems more poetic of him. Could be either or though, I guess. [[Special:Contributions/172.68.90.126|172.68.90.126]] 05:33, 24 October 2016 (UTC)
 
I got the impression that Beret Guy wasn't trying to return the light itself back to the stars, but give the stars the same pretty image they get on Earth by "looking" at the mirror. Seems more poetic of him. Could be either or though, I guess. [[Special:Contributions/172.68.90.126|172.68.90.126]] 05:33, 24 October 2016 (UTC)
  
The function of art is to hold a mirror up to nature.... {{unsigned ip|173.245.48.183}}
+
The function of art is to hold a mirror up to nature....
 
 
Maybe I'm weird, but I feel no one understands Beret Guy here. Clearly (to me), when he hears that photons travel millions of years only to then "die" on our eyes, he puts up a mirror, so that photons instead of "dying" are reflected back to travel the universe. I don't really see why he would want to send them back home, is it not really rude to send someone home just after they arrived? However in reality, when a photon hits a mirror, is "dies" anyway, as it excites given atom, and that atom then "shoots" new photon, with same phase and frequency in the direction given by law of reflection. Unless that counts as the same photon.
 
Also, I would like to offer a though I read in "Lectures on physics by Richard P. Feynman". He claims, that light never slows down, never reflects and is never absorbed. Instead, when a photon "hits" an atom, that atom radiates a photon in same direction with opposite phase. This duo then travels together for the rest of eternity, undetectable as it has no effect on universe (opposite phase photons cancel out). In that case, Beret Guy's effort would be meaningless, as photons are immortal whether they hit a mirror or eye or ground. [[Special:Contributions/172.70.85.73|172.70.85.73]] 10:31, 7 January 2022 (UTC) mauriicio
 

Please note that all contributions to explain xkcd may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see explain xkcd:Copyrights for details). Do not submit copyrighted work without permission!

To protect the wiki against automated edit spam, we kindly ask you to solve the following CAPTCHA:

Cancel | Editing help (opens in new window)

Template used on this page: