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Most Distant Object Ever Seen By Telescope
Message
De
29/04/2009 07:46:39
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivie
 
 
À
28/04/2009 16:48:42
Information générale
Forum:
Politics
Catégorie:
Autre
Divers
Thread ID:
01396822
Message ID:
01396889
Vues:
60
There is one problem with the news as stated - the statement that the object is 13 billion light-years away. If it is 13 billion years old, that means the light travelled for 13 billion years. But in the meantime, the object has been going away from us - faster than the speed of light.

Normally, objects can't move faster than the speed of light - but in this case, space itself is expanding. The speed of objects within ther local space will not surpass the speed of light, though. (The technical term seems to be something like "metric expansion of space" - you can check this in the Wikipedia, but the explanation is quite technical. I would just say "space itself is expanding", although I am not sure how technically correct this is.)

>http://www.javno.com/en-world/far-sighted--telescope-snaps-most-distant-object_254251
>
>Pretty coooooool:
>
>Astronomers tracking a mysterious blast of energy called a gamma ray burst said on Tuesday they had snapped a photograph of the most distant object in the universe -- a smudge 13 billion light-years away.
>
>Hawaii's Gemini Observatory caught the image earlier this month after a satellite first detected the burst.
>
>"Our infrared observations from Gemini immediately suggested that this was an unusually distant burst, these images were the smoking gun," said Edo Berger of the Harvard Smithsonian Center for Astrophysics.
>
>Distortions in the light signature of the object show it is 13 billion years old -- at the speed of light, 13 billion light-years away. A light-year is 6 trillion miles (10 trillion km).
>
>This makes it easily the most distant object ever seen by humanity, Berger said.
>
>Gamma-ray bursts are luminous explosions that mostly occur when massive stars run out of fuel and begin collapsing into either a black hole or a neutron star.
>
>"I have been chasing gamma-ray bursts for a decade, trying to find such a spectacular event," said Berger. "We now have the first direct proof that the young universe was teeming with exploding stars and newly-born black holes only a few hundred million years after the Big Bang," he said.
>
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
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