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Solar_System-2 - The Solar System The Solar System 1 sta...

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Unformatted text preview: The Solar System The Solar System 1 sta • 1 star • 9 8 planets • 63 (major) moons • asteroids, comets, meteoroids The distances distances to planets are known from Kepler’s Laws (once calibrated with radar ranging to Venus (once calibrated with radar ranging to Venus) How are planet How are planet sizes sizes determined? determined? Measure angular size on sky, Measure angular size on sky, Then use geometry….. Then use geometry….. Using angular size to get actual size Masses Masses- determined through observing the gravitational effect of the planet on some nearby object (moons nearby planets satellites planet on some nearby object (moons, nearby planets, satellites) Density Density- divide mass by volume • Planets orbit the sun counte sun counter- clockwise as seen from the North Celestial Pole. • All planets are in the same orbital plane EXCEPT Mercury and Mercury and Pluto. Terrestrial Planet Terrestrial Planet Jovian Planet Jovian Planet Terrestrial Planets Terrestrial Planets • Mercury, Venus, Earth Jovian Planets Jovian Planets • Jupiter, Saturn, and Mars •Close to Sun •Small masses, radii Uranus, and Neptune •Far from Sun •Large masses and radii •Rocky, solid surfaces •High densities Slow rotation •Gaseous surface •Low densities •Fast rotation •Slow rotation •Weak magnetic field •No rings Fast rotation •Strong magnetic field •Many rings •Few moons •Many moons Terrestrial planet Terrestrial planets Jovian planets (and earth) Asteroids- rocks with sizes greater than 100m across Most asteroids remain in the Asteroid belt between Mars and Jupiter but a few have orbits that cross Earth’s path....
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