Size of the observable universe
[DOC File]Background Material
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If the Universe is 13 billion years old, the size of the observable Universe expanded from zero radius at the Big Bang to 13 billion light years at the present epoch. Where did the Big Bang occur? Since space was created in the Big Bang, it didn't occur at a single location, it occurred everywhere simultaneously.
[DOC File]How Big is Our Universe
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Question 2: Could the universe be bigger than our estimated size of the universe? Why or why not? Question 3: You might expect the observable universe to only have a radius of 13.7 billion light years away, because light has only had 13.7 billion years to travel.
[DOCX File]galaxy
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5) If inflation really occurred, then our observable universe is only a tiny portion of the entire universe born in the Big Bang. Answer: TRUE 6) Observations of the cosmic background radiation from the COBE satellite revealed tiny variations in its temperature from one place to another (corresponding to a few millionths of a degree Kelvin).
[DOC File]ASTRONOMY 5
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Which of the following statements about the observable universe is correct? It includes all the galaxies in the universe. It is the same size for all possible vantage points . It extends to the edge of the universe. It includes the same region of space for all possible vantage points.
[DOC File]Lick Observatory
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(grades 4-6) Libby Black. Concepts Addressed: The Big Bang, the Universe, history of cosmology, scientific theories, relative size of things, expansion of the universe. Lesson Goals: The students will understand the origin and basis of the Big Bang theory and become familiar with the relative size of things, the age of the known universe, the expansion of the universe, and the idea of accepted ...
Universe - Wikipedia
At the beginning of inflation, the observable Universe was about 1050 times smaller than that, or 10-48 cm. This is much smaller than any known structure, even the tiniest elementary particle. INFLATION BLEW UP THE OBSERVABLE UNIVERSE FROM SUB-QUANTUM SCALES (10-48 cm) TO MACROSCOPIC SIZE (1 meter).
[DOC File]Astronomy at the University of Texas at Austin
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In 2003, NASA's WMAP satellite took images of the most distant part of the universe observable from Earth. The image shows the furthest we can see using any form of light. The patterns show clumps of matter that eventually formed into galaxies of stars.
[DOCX File]Department of Astronomy and Steward Observatory
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These structures are much smaller than size of observable universe (~ 5000 Mpc). [Note: Universe could be much larger, or even infinite—we just can’t see back any further in time or space.] ( So homogeneity assumption probably OK. 2. Isotropy—no preferred direction. Universe looks the same in all directions. OK.
[DOC File]Astronomy at the University of Texas at Austin
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1. Homogeneity—local universe looks about the same no matter where you are in it. This is same as saying: no structure on size scales larger than a small fraction of size of observable universe. Largest known structures ~ 200-300 Mpc (“Sloan Great Wall”—see Fig. 26.1; pencil beam survey in Fig. 26.2).
[DOCX File]galaxy
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In the 1980s, to account for the near-critical density of the Universe and the isotropy of the cosmic background radiation, the American theorist Alan Guth proposed a short inflationary period in the early Universe from 10-35 s to 10-33 s where the observable Universe ballooned in size from 10-27 m, smaller than a neutron, to a billion light-years across
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