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4 - The Scale of the Universe

4 - The Scale of the Universe. Distances - stellar parallax (sometimes called “ heliocentric parallax ” ). Click on me. http://www.astro.ubc.ca/~scharein/a311/Sim.html. pc ⇒ parsec = “ par allax sec ond ” (1 pc ~ 3.26 “ light-years ” ).

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4 - The Scale of the Universe

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  1. 4 - The Scale of the Universe

  2. Distances - stellar parallax (sometimes called “heliocentric parallax”) Click on me http://www.astro.ubc.ca/~scharein/a311/Sim.html

  3. pc ⇒ parsec = “parallax second”(1 pc ~ 3.26 “light-years”) 1 pc ~ 206,265 AU. The nearest star (other than the Sun) is 1.3 pc away…..

  4. Our Galaxy - The Milky Way Our view in visible light General Structure & Scale - diameter is ~40,000x the distance to the nearest star #stars ~ 300 billion (300,000,000,000)

  5. Nearest Other Galaxies Andromeda Galaxy ~900,000 pc (2.9 million ly*) *(the light we see today left Andromeda 2.9 million years ago!) Large & Small Magellanic Clouds ~60,000 pc away

  6. Most Distant Galaxy (as of 2011) ~4 billion pc or 13 billion ly* *(the light we see left that galaxy 13 billion years ago!) # galaxies in universe > 100 billion Take these tours of the scale of things: http://apod.nasa.gov/apod/ap120312.html http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/

  7. 100 x 109 galaxies X 100x109 stars/galaxy (for example) = 1022 stars in the universe** What are the chances that only 1 (ours) has a planet with life? **(1022 = 10,000,000,000,000,000,000,000 !!!)

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