To your first question: The Big Bang theory states that the universe started out really 'small' and got bigger. So, out at the edge of our vision (way back in the past), we're looking at the beginning of time - we can't see past it, because...
http://www.bautforum.com/space-astronomy-questions-answ...
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Why can't we see past the cosmological horizon? ... Beyond the cosmological horizon, we would be looking back to a time before the universe was born. Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.
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boojum.as.arizona.edu/~jill/NS102_2006/Quizzes/c20conce...
boojum.as.arizona.edu/~jill/NS102_2006/Quizzes/c20concept.html
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Why can't we see past the cosmological horizon? ... c. The cosmological horizon is infinitely far away, and we can't see to infinity. ... d. Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond...
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boojum.as.arizona.edu/~jill/NS102_2004/chapter20key.htm...
boojum.as.arizona.edu/~jill/NS102_2004/chapter20key.html
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Why can't we see past the cosmological horizon? ... Beyond the cosmological horizon, we are looking back to a time before the universe had formed. ... The cosmological horizon is infinitely far away, and we can't see to infinity.
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www.shari.com/2002/04/phys_1412_quiz_.html
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We see many lanes of dark material blocking out the light of stars behind them along the band of the Milky Way. ... We see evidence that small galaxies in our Local Group have experienced several collisions in the past.
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www.shari.com/2002/04/phys_1412_quiz__1.html
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. ... 1) Based on counting the number of galaxies in a small patch of the sky and multiplying by the number of such patches needed to cover the entire sky, the total number of galaxies in the ... A) 100 million.
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www.physics.sfsu.edu/~cvanajak/Review_Hubble_Law.html
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The problem amounts to finding the time tem at which the light that we now receive has been emitted in the past. From the previous equations we can see that the distance covered by the light is readily known thanks to the parameter introduced in the equations (11)-(12) and giving the distance from us to the horizon.
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www.lacosmo.com/horizon.html
www.lacosmo.com/horizon.html
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Let me know if you want the June 2009's Newsletter, which was the previous one. Past Newsletters can be seen here: ... In this way, the project seeks to link the sky we can all see with the deep, “hidden” cosmos that astronomers study on a daily basis. The wonderful quality of the images is a testament to the splendour of...
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www.telescopes-astronomy.com.au/telescope_astronomy_new...
www.telescopes-astronomy.com.au/telescope_astronomy_newsletters_advice_products_information.htm
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(B) we see no radiation from their cores. (C) they change in brightness on short time scales. (D) they tend to have big halos. (E) all galaxies have the same brightness. 9. Why can’t we see past the cosmological horizon?
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www.astro.umass.edu/~myun/teaching/a100/exam3.pdf
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