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sun contains

99.8% of solar systems mass

mercury

both extreme hot and colds

venus

hottest planet

earth

first planet from sun with a moon

4 rules

objects orbit in organized manner, 2 types of planets, aasteroids and comets, exceptions

organized ( rule one)

all planetary orbits are nearly circular, all planets orbit sun in same direction, most planets rotate in same direction that they orbit, most planets exhibit similar properties

terrestial planets

Mercury, venus, Mars, Earth = small and dense, rocky with metals

jovian planets

jupiter, saturn, uranus, neptune = larger in size but less dense, hydrogen, helium

aesteroids

rocky bodies that orbit the sun much like planets, but are smaller,

asteroid belt

where most asteroids are, between orbits of mars and jupiter

kuiper belt

beyond orbit of neptune, contains 100,000 comets

exceptions

uranus rotates on its side, venus rotates backwards, earth has large moon

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