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Download Introduction to the solar system guided notes.pptx
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Name: _____________________________________ Entry #: ____ Chapter 4.1 Introduction to the Solar System Changing views of our solar system • Earth at the center of the universe • Everything was in spheres rotating around ________________________ • ~ 150 AD _______________________ published a model of the solar system The Sun at the center of the universe • ~1500 years after Ptolemy • ___________________________ proposed Sun in the center of the universe • Model wasn’t published till he died • Wasn’t until _____________________ created his telescope • Proposed the planets orbit the sun like the moons of Jupiter orbited the planet Planets and their motion • _____________________________: the sun and all the objects that are held together by the suns gravity • 8 planets, 5 dwarf planets, over 165 moons, many asteroids and other objects What is and is not a planet • Pluto controversy • Planet was discovered in 1930 later to find that it wasn’t like the other 8 planets • They were using older telescopes so they didn’t have the ability to see Pluto and its moon as two separate things What makes a planet a planet? • A planet must be the following • Orbit a ______________________ • Be big enough that its own ________________________ causes it to be round • Be small enough it isn’t a _________________________ itself • Have ________________________ that area of its orbit • Dwarf Planet • If the first three listed above are true The size and shape of orbits • The ____________________________ from the sun the ____________________ the one planets orbit is to the next planet • Planets are held in their orbits by ___________________________________ • Gravity depends on the mass of the object and how far apart the objects are from each other Extrasolar planets • Since early 1900’s we have discovered other solar systems • ___________________________________ • When a planet orbits a star other than our Sun • Signs • Slight motion in the star due to the planets ___________________________________________ • _______________________________________________ star’s light as the planet passes in front
