ISP 205 Visions of the Universe Exam 1

ISP 205 Visions of the Universe Exam 1 - ISP 205 Visions of...

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ISP 205 Visions of the Universe Exam 1 I. A perspective of the Universe (1/08/2008; chapter 1) A. Star – a large, glowing ball of gas that generates heat and light through nuclear fusion B. Planet – a round object which orbits a star; cleared out the neighborhood (Not a lot of excess debris around it). Planets may be rocky or gaseous in composition C. Moon – natural object which orbits a planet D. Asteroid – small and rocky object that orbits a star E. Comet – A relatively small and icy object which orbits a star. When a comet gets close to the star it orbits, it heats up and the debris and ice melt and make the “tail” of the comet. F. Solar System – a star and all the material orbiting the star G. Nebula – an interstellar cloud of gas and/or dust H. Galaxy – a great island of stars in space, all held together by gravity and orbiting a common center. (100 billion galaxies in the universe) I. Universe – the sum total of all matter and energy; that is, everything within and between all galaxies J. Light year – distance light travels in one year; which is about 10 trillion kilometers II. History of the Universe A. Big bang starts the expansion B. 3 minutes later, nearly all of the hydrogen and helium forms C. Expansion proceeds except where gravity “wins”; i.e. stars, galaxies, clusters D. Stars create all the elements heavier than helium E. Rocky planets form F. Life begins from “star stuff” on at least one particularly friendly planet I. Sizes, distances and motions in the universe (1/10/08) A. Use the ten billion to one scale to help comprehend the relative sizes and distances in the universe 1. Divide the real length by ten billion (10^10) to get the scale model distance in the same length units 2. Hubble Telescope is 600 km above the earth
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B. How large is the Milky Way galaxy? 1. Has about 100 billion stars 2. It’s about 100,000 light years across C. How large and old is the universe? 1. Scientists nowadays think that there are about 100 billion galaxies, so along with 100 billion stars per galaxy multiplied together, we get 10^22 stars in the universe 2. The cosmic calendar a. if the entire age of the Universe were one calendar year b. One month would be about 1.2 billion years D. How is Earth moving in our solar system? 1. Rotates once a day; Counterclockwise if viewed from the north pole 2. Orbits the sun once a year at over 100,000 km/h 3. Tilted at a 23 ½ degree angle E. “rule” of the solar system rotation and orbits – almost everything in the solar system rotates in a counter clockwise fashion if viewed from the north F. How is our Solar system moving in the Milky Way galaxy? 1.
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This note was uploaded on 03/19/2008 for the course ISP 205 taught by Professor Donahue during the Spring '08 term at Michigan State University.

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ISP 205 Visions of the Universe Exam 1 - ISP 205 Visions of...

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