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Message Subject: march 12th hubble ultra deep field
Posted By: physics101 Date: Wednesday, March 31 at 1:12 p.m. on the march 12th Hubble Ultra Deep Field segment a question was asked by a caller, which is something I have pondered and have never had successfully answered. The scientist on the show obviously didn't understand the caller's question. He wanted to know how it is possible to see light from stars that are 13.2 or so billion light years away. If we started at the same point and matter can't travel the speed of light how has the initial light of stars 13.2 billion years ago not passed us. We would have to be very near where we are now 200,000,000 years after the big bang in order for light that old to reach us and not already have passed us. Unless we started inflation near the speed of light and the net speed of light is so low that it could take that long, however, there would still be a limit. In addition wouldn't that make the "Big Rip" theory impossible. We would already be breaking up. Since the universe is accelerating still and in order to see the light of a star 13.2 billion light years away, and space is inflating at close to the speed of light, then the stars must be nearly 26.4 billion light years away now, or they were 6.6 billion light years away when the light was emitted and scientists are just doing the math and the star is 13.2 billion light years away, but the light was emitted 6.6 billion years ago and we guestimate the distance the star would be now. the star has traveled immense distances beyond 13.2 billion light years away since the light we are now seeing from it was emitted. What makes this more confusing is how can we see light or CMBR 300,000 years after the big bang. We would have to almost instantaneously reposition to where we are now, or be traveling (inflating)over 99% the speed of light. This also applies even if the earth and the other object our heading away from eachother netting a speed close to the speed of light. Sorry for being so verbose. Thanks My reply to the above post was that it must be the case that the light we see now IS NOT in fact thirteen plus billion years old. Instead, this must be a incorrect (albeit widely held) viewpoint not unlike the belief that the Great Wall of China is the only man made object that can be viewed from space. Can someone give me an alternative explanation that I can understand? |
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