Review Questions Chapt 1

Review Questions Chapt 1 - 4 What did Carl Sagan mean when...

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SC404.01 January 15, 2008 Page 22 Review Questions Chapter 1 2. Briefly describe the major levels of structure (such as planet, star, galaxy) in the universe. Planets are moderately large objects which orbit a star and may be rocky, icy, or gaseous in composition. Stars are large glowing balls of gas that generate heat and light through nuclear fusion. A galaxy is a great island of stars in space, all held together by gravity and orbiting a common center 3. What do we mean when we say the universe is expanding ? How does expansion lead to the idea of the Big Bang ? When we say the universe is expanding, it means that the distances between galaxies are increasing over time. When looking at the fact of expansion, we can assume that at one point in the past the galaxies were closer together. Therefore, if we look back to the beginning of this expansion, scientists derived from this the Big Bang theory.
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Unformatted text preview: 4. What did Carl Sagan mean when he said that we are “star stuff”? Carl meant that we were made from the materials manufactured in stars because of the simple elements that were born in the Big Bang. 12. What is the shape of the Milky Way Galaxy? Where is our solar system located within the galaxy? How does our solar system move within the galaxy? The Milky Way is a huge disk-shaped collection of stars. Our solar system is located about halfway from the galactic center to the edge of the galactic disk. Within our local solar neighborhood, we move in random directions relative to each star in this neighborhood. Looking at the bigger picture, the entire Milky Way rotates around a galactic center, one orbit equaling 230 million years....
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