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Author Topic:   Thermodynamics and The Universe
Doddy
Member (Idle past 5909 days)
Posts: 563
From: Brisbane, Australia
Joined: 01-04-2007


Message 15 of 186 (383362)
02-07-2007 7:32 PM
Reply to: Message 12 by NosyNed
02-07-2007 5:48 PM


Re: Light stretching
NosyNed writes:
As the recession velocity approaches c (light speed) the wave length is stretched to infinity and the galaxy is no longer visible.
I remember reading that this isn't true, but I can't remember the theoretical reasoning. But I do know that we can see galaxies outside of the Hubble sphere (which were receding superluminally when they emitted the photons that our telescopes can see).
I'll have to wait for the explanation too. Something about the Hubble sphere growing, I think...?

"Der Mensch kann was er will; er kann aber nicht wollen was er will." (Man can do what he wills but he cannot will what he wills.) - Arthur Schopenhauer

This message is a reply to:
 Message 12 by NosyNed, posted 02-07-2007 5:48 PM NosyNed has replied

Replies to this message:
 Message 17 by NosyNed, posted 02-07-2007 8:12 PM Doddy has not replied
 Message 18 by RAZD, posted 02-07-2007 8:29 PM Doddy has not replied

  
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