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Unformatted text preview: b. some clusters are embedded in gaseous nebula [orions nebula] 5. solar system a. a star and the various bodies that orbit around it 6. star a. starts are big balls of gas that are gravitationally bound and generate energy by nuclear fusion b. our sun is a star [nuclear fusion] 7. planet a. some what controversial b. any object smaller then a star but big enough to dominate surroundings c. or something that forms like known planets and not like stars 8. moons/asteroids/comets a. moon i. instead of orbiting stars they orbit planets ii. not necessarily smaller then planets b. asteroids and comets i. asteroids are pieces of rock orbiting the sun 1. meteorites: asteroids that hit earth ii. comets: dirty pieces of ice orbiting the sun 9. interplanetary dust a. asteroids and comments are not the smallest solar system bodies...
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- Spring '09
- Solar System, Planet, galaxy cluster a.