XPost: sci.physics.relativity   
   From: relativity@paulba.no   
      
   Den 10.09.2025 10:40, skrev Thomas Heger:   
   > Am Montag000008, 08.09.2025 um 14:23 schrieb Paul B. Andersen:   
   >> Den 07.09.2025 10:26, skrev Thomas Heger:   
   >>>   
   >>> It simply wouldn't make sense, to find patterns in stars, which do   
   >>> not belong to the same time.   
   >>   
   >> Consider a star 10000 light years away.   
   >>   
   >> Does this star and the Sun "belong to the same time"?   
   >   
   > No!   
      
   But we sure can "find patterns" in a star 10000 ly away.   
   The spectrum of the star will tell us the following properties   
   of the star 10000 years ago:   
   its mass, temperature, if it was a new born star, a main sequence star,   
   or a star approaching the end of its life-   
   If it is a main sequence star with spectral class A0V, its lifespan   
   will be ~ 100 million years.   
   If it is a main sequence star with spectral class G2V, like the sun,   
   its lifespan will be ~ 10 billion years.   
   If it is a main sequence star with spectral class K9V, its lifespan   
   will be ~ 70 billion years.   
      
   The point is that if we see that the star was a main sequence star   
   10000 years ago, we can be pretty sure that it still is   
   a main sequence star now. The radial speed of the star will be   
   known by its Doppler shift, and several measurements of its position   
   will reveal its proper motion. That weans that we will know where   
   the star is now.   
      
   We know that the Sun was a main sequence star 10000 years ago.   
      
   >   
   > We see stars in 10000 light years distance as they were and where they   
   > had been 10000 years ago, while we see our Sun as the Sun has been 8   
   > minutes ago. That is a HUGE difference.   
   >   
   > The picture we see is actually 'layered in time', while the universe isn't.   
   >   
   >   
   > Therefore we see things, which are not real and which do not belong to   
   > the same time.   
      
   We see that the star was real 10000 years ago, and if it was   
   a main sequence star then, we know that it still is a real   
   main sequence star now.   
      
   It is indeed a weird idea that a star that was real 10000 years   
   ago is not real now.   
      
   What do you think stars we see in the telescope are?   
   Mirages?   
      
      
   You snipped this:> Photons from the star will be absorbed by the Sun,   
   > so the star will transfer energy to the Sun.   
   > Could we call that an interaction?   
   >   
   > Will this star interact with the Sun in a different way   
   > than the Sun will interact with the star?   
      
   We know that the star and the Sun were 10000 light years   
   from Each other 10000 years ago, and we know that the star   
   and the Sun still are ~10000 light years away from each other.   
      
   And for million years the two stars have transferred energy   
   (light) to each other, and will keep doing so for million   
   of years.   
      
   The stars are at any time living side by side 10000 light years   
   from each other.   
   That we happen to live close to one of them doesn't make them   
   "belong to separate times."   
      
   They are both living at the same time.   
      
   --   
   Paul   
      
   https://paulba.no/   
      
   --- SoupGate-Win32 v1.05   
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