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Geomagnetic storm wikipedia , lookup
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8/30/2012 Objectives Overview of our Solar System What is included in our solar system family? Early Astronomers • To identify what is included in our solar system • To describe what different parts of our solar system have in common • To describe what makes the different parts of the solar system different Geocentric Model • The first astronomers in 600 BC made accurate observations of space • Ptolemy • Earth is the center of the solar system • Everything revolved around the Earth • Stars are farther away than planets • Stars appeared smaller than planets • Stars were always there, planets were not Heliocentric Model • Copernicus • Sun is the center of the solar system • All planets revolve around the sun • Current Model The Sun • At the center of our solar system • Contains 98.5% of all of the mass of the solar system • The first thing formed in our solar system • The largest and only star in our solar system • Provides almost all of the energy used in the solar system • Earth only gets 0.000000001% of the sun’s total energy 1 8/30/2012 Planets • Planets were made after the sun started forming • Planets are smaller than the sun • Planets must be: • Spheres • Elliptical Orbit the sun • “Clear their neighborhood” or have no matter in their orbital path • We have 8 planets Other members of the Solar system • Dwarf Planet: Pluto • Moon: Orbits a planet • Comets: Rocks & metals held together by frozen gases Other Members of the Solar System • Asteroids: “Flying Mountains” or large rocks • Meteors: “Shooting stars” or small rocks that burn up in our atmosphere • Meteorite: “Shooting stars” that hit Earth 2