Solar_System - The Solar System The Solar System 1 star 9 8...

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Unformatted text preview: The Solar System The Solar System 1 star 9 8 planets 63 (major) moons asteroids, comets, meteoroids 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.. The distances distances to planets are known from Keplers Laws (once calibrated with radar ranging to Venus) 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) Density Density- divide mass by volume Planets orbit the sun counter- clockwise as seen from the North Celestial Pole. All planets are in the same orbital plane EXCEPT Mercury and Pluto. Terrestrial Planets Terrestrial Planets Mercury, Venus, Earth and Mars Close to Sun Small masses, radii Rocky, solid surfaces High densities Slow rotation Weak magnetic field No rings Few moons Jovian Planets Jovian Planets Jupiter, Saturn, Uranus, and Neptune Far from Sun Large masses and radii Gaseous surface Low densities Fast rotation Strong magnetic field Many rings Many moons 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 Earths path....
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Solar_System - The Solar System The Solar System 1 star 9 8...

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