nous a donc écrit :

Just been listenin to "In Our Time"


If Hubble captures the light of galaxies (not just background
radiation) that are 13 bn years old and the universe is approximately
14 bn years old, how come we can see it?

Wouldn't the universe be a maximum of 1 billion light years across
when this light was created and it therefore would have gone past us
12 bn years ago? I thought that the speed of light is an absolute
limit, so to repeat the obvious it would have been produced when the
universe was 1bn years old, but 13 bn light years across (mimimum).

Please answer ASAP as I need to sleep.

OK, as this seems to be an emergency, I suggest you to read this short page
http://www.atlasoftheuniverse.com/redshift.html

PS No maths please.

PPS This probably a really stupid question and the 1bn light years bit
is more to illustrate the question rather that being a real figure.

There is no stupid question.
Only stupid answers )

--
Norbert. (no X for the answer)
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knowing the universe - stellar and galaxies evolution
http://nrumiano.free.fr
images of the sky http://images.ciel.free.fr
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