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annmariehayes (September 8, 2008 at 3:36 am)
Thank you for taking out the idiot! What a waste of time he was.
KawaiiRiniNekoBunny (September 7, 2008 at 10:22 pm)
Wow...Somehow my life seems so insignificant now...
Pulsar89 (September 7, 2008 at 4:05 pm)
(cont)While better telescopes could push the "distance record" beyond 30 billion ly, it's not possible to see anything beyond 47 billion ly; that corresponds to a travel time for their light of 13.7 billion years, i.e. the age of the universe. So, the light from galaxies beyond 47 billion ly hasn't reached us yet because the universe isn't old enough.
Pulsar89 (September 7, 2008 at 3:59 pm)
Not exactly. The furthest galaxies in the Hubble Ultra Deep Field image are about 13 billion years old, but their distance is larger: about 30 billion ly. This might seem a contradiction, but it isn't: between the moment those galaxies sent out their light and the moment it reached us, the universe expanded. So the galaxies moved further from us, which makes their current distance larger than the distance their light had to travel.
andrewjohngordon (September 7, 2008 at 9:21 am)
There is a little mistake in this video at 5:42. Yes the universe is now thought to be 47 billion LY in radius, but the Hubble Ultra Deep Field image is looking to a distance of around 13 billion LY. We can't see any further than around 15 billion LY because the universe isn't old enough and by the time the light from 47 billion LY has reached us the universe will be even bigger.
luthienknowsbest (September 7, 2008 at 8:02 am)
what is the title of the song?
FreakzEmo (September 7, 2008 at 1:19 am)
so beautiful...
7ochka (September 6, 2008 at 10:59 pm)
I have seen this video way too many times, I wish I could stop
Manuelprodigy (September 6, 2008 at 9:52 am)
our lives are insignificant..compared to the universe.
Pulsar89 (September 5, 2008 at 4:55 pm)
The Hubble Telescope has a 2.4 meter mirror. Its successor will be the James Webb Space Telescope (planned for 2013), with a 6.5 meter mirror. But the ground-based telescopes will become truely gigantic: the E-ELT (in 2017) will have a 42 meter mirror! |
