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Expansion of Universe?
[Moderator's note: In contrast to the previous post, this one was
submitted with lines which were too long, which caused the post to get encoded with "=" denoting the line break. Please figure out how to send non-encoded plain text with lines which are not too long. -P.H.] I thought I understood this but now question my understanding........... I don't know how to be explicit with this question in fewer words. Any hel= p in showing where I'm thinking wrong appreciated. Suppose humans had been monitoring the universe for 3 billion years now. = =20 So, we had records from an age of say, 10.7, 11.7, 12.7, and now, 13.7 bill= ion years, where each of those were the observed age of the universe to the= CBR veil, beyond which we cannot observe optically. So we have 3 billion = years worth of observational data forming 4 data points for the distance to= the CBR, and, galaxies that formed from the ancient CBR gas. Hopefully the following helps illuminate my error: At universe age 10.7E9 years, first data point, the light reaching us from = the CBR would have traveled, well, 10.7E9 years in time and would have trav= eled 10.7E9 Lyr distance to reach us. At age 11.7E9 years, the light from the CBR would have traveled for 11.7E9 = years. And, light from the CBR a billion years earlier would have now form= ed into infant galaxies, 1 billion years old. Light from those galaxies wo= uld have traveled 10.7E9 light years to reach us. At 12.79E9 years age of the universe, the light from the CBR would have tra= veled for 12.79E9 years to reach us, and we would see galaxies from the pre= vious two epochs, now at universe age 1 billion and 2 billion years old. T= he light from those galaxies would have traveled 11.7E9 and 10.7E9 years to= reach us. Finally, today, we observe the CBR as having come from the last scatterings= of the big bang when the universe became transparent about 13.7E9 years ag= o and we today call that the age of the universe. =20 We would still observe the evolution of galaxies that formed out of the CBR= gas from epoch 1, 2, 3....with today being epoch 4. The young galaxies observed would have emitted their light 10.7E9, 11.7E9, = and 12.7E9 years ago. The problem is, the galaxies at 10.7E9 light years away haven't moved in ra= dial distance over the 3 billion years of observations. What's wrong? |
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Expansion of Universe?
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