NATS_1-15 - b some clusters are embedded in gaseous...

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What is astronomy? Observations of tings in the skies [observe] [predict] What is astrophysics? Application of physics to astronomy [explain] Scientific method: 1.Data 2. Develop a hypothesis to explain the observation 3. Apply hypothesis to a new situation and test validity STRUCTURE IN THE UNIVERSE: 1. universe a. the universe is everything we can possibly see: starts, planets, intergalactic materials, and dark matter 2. galaxy cluster a. the universe is clumpy; galaxy cluster together because of the gravity b. largest structures in the universe are galaxy clusters 3. galaxy a. a collection of billion s of starts clouds of dust and gas and dark matter orbiting a common center b. our solar system is on ly a tiny part of the milky way 4. star clusters a. galaxies contain come clusters and also some field stars of many which were in clusters but later on got dispersed [like our sun]
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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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NATS_1-15 - b some clusters are embedded in gaseous...

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