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Solar system

TermDefinition
Astronomical unit Used to measure far distances in space 1 AU=Distance from earth to sun.
Meteoroid Chunk of rock smaller that asteroids
Meteor Streak of light
Meteorite Space rock found on earth
Asteroids Millions of small rocky objects that orbit the sun in the asteroid belt between Mars and Jupiter.
Comets Made of gas, dust, and ice, revolve around the Sun in the Kuiper Belt and Oort Cloud
Inner planets Terrestrial planets Solid and rocky Mercury, Venus,earth,mars
Outer planets Gas giants Made of ice and gas Rings and moons Hydrogen and helium.
Mercury Closest planet to the sun Not the hottest-so small it lacks gravity and atmosphere.
Venus Hottest planet Greenhouse effect Day is longer than a year-rotation time longer than it’s revolution Acid clouds.
Earth Only planet with known life Moderate temperatures Protective atmosphere Liquid water
Mars Largest known mountain-Olympus mons Possible signs of life.
Terrestrial planets The four inner planets.
Greenhouse effect Occurs when a planets atmosphere traps solar energy and causes the temperature to increase.
Jupiter Largest planets Galilean moons Great Red Spot
Saturn Most complex ring system Least dense planet-it would float Titan-largest moon.
Uranus Rotation axis is tilted 90 degrees so rotates like a bowling ball
Neptune Longest period of revolution Swirling storms-windiest planet.
Gas giants Jupiter,Saturn,Uranus,Neptune Nickname for the 4 outer planets.
Galilean Moons 4 moons Galileo discovered around Jupiter -Io,Europa,Ganymede,Callisto
Dwarf planets Pluto was the first Same as planet but not larger than its neighbors Ceres in the asteroid belt
Created by: user-1979397
 

 



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