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Down to Down to BasicsBasics

Some important terms Some important terms to understand our solar to understand our solar

systemsystem

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On the Move…On the Move…

Rotation Rotation

movement of a movement of a body on its body on its imaginary axisimaginary axis

RevolutionRevolution

movement of one movement of one object around object around anotheranother

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On the Move…On the Move…Day Day

period of time for period of time for one complete one complete rotationrotation

YearYear

period of time for period of time for one complete one complete revolutionrevolution

Orbit path of a body path of a body during during revolutionrevolution

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Things that Move…Things that Move…

Solar systemSolar systema star and the a star and the celestial objects celestial objects that orbit the starthat orbit the star

Our solar system Our solar system contains the Sun, contains the Sun, planets, moons, planets, moons, asteroids, and asteroids, and cometscomets

NASA

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Things that Move…Things that Move…

StarStarself-luminous object; our star is called self-luminous object; our star is called the Sunthe Sun

SatelliteSatellitesmaller object that orbits a larger smaller object that orbits a larger objectobject

PlanetPlanetobject that orbits a starobject that orbits a star

MoonMoonobject that orbits a planetobject that orbits a planet

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Things that Move…Things that Move…

AsteroidAsteroid

small rocky body that orbits the Sun; small rocky body that orbits the Sun; may be contained in the asteroid beltmay be contained in the asteroid belt

CometComet

““dirty snowball” composed of ice, rocky dirty snowball” composed of ice, rocky material, dust and gases; very eccentric material, dust and gases; very eccentric orbit orbit

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Cover-Ups…Cover-Ups…

AtmosphereAtmosphere

blanket of blanket of gases that gases that surrounds a planetsurrounds a planet

Venus Jupiter Titan (moon)Has an atmosphere

Ganymeade (moon) Mercury Has no atmosphere