Androcles wrote:
What causes the red shift? Only one cause?

No. There are understood to be at least three distinct causes of the
red shift: recessional red shift, gravitation red shift, and cosmological
(expansion) red shift.

What about E = h\nu ?

What about it? I'm not trying to be sarcastic; you're really being too
elliptic.

Isn't E spread over a greater surface area, the further away the
emitter is?

Yes. What are you driving at?

Of these questions, the first is quantum-mechanical; the second is
classical. Would you like to clarify why you are asking these disparate
questions?

--
Brian Tung
The Astronomy Corner at http://astro.isi.edu/
Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt