solar system - The sun and the planets and other objects that orbit the Sun, Asteroid - a rocky, metallic object that orbits the Sun found mostly in the region between Mars and Jupiter, Comet - a small object in space that orbits a star and is made of ice, dust particles and frozen gases. It's from the Kuiper Belt or Ort Cloud, Meteor - a piece of rock or metal from space that is burning in Earth's Atmosphere , Meteorite - When a meteor lands on the Earth's surface (you might find it), Venus - Earth's twin, hottest planet because of greenhouse effect has a retrograde rotation, Earth - 1 Astronomical unit from the Sun only planet with lots of liquid water and life, 3rd from the sun, Mars - Red planet because of the iron rich soil, has 2 moons, evidence of liquid water in the past, Jupiter - Largest planet in the solar system huge storm called the Great Red Spot and has more than 60 moons, Saturn - Planet with visible rings, it it less dense than water, has more than 60 moons, 6th planet from the sun, Uranus - Axis is tilted 98 degrees (on its side) has a retrograde rotation7th planet from the sun, Neptune - Blue gas/ ice giant, windiest planet in the solar system and coldest, Period of rotation - the amount of time it takes an object to spin (Rotate) one time on its axis, Period of revolution - The amount of time it takes an object to travel around the sun, Mercury - Planet closest to the sun, no atmosphere, largest temperature range of all planets, Dwarf planet - Kuiper belt object that orbits the sun and is larger than an asteroid and smaller than a planet and has a nearly round shape, Astronomical unit (AU) - The distance between the Earth and the sun (93 million miles or 150 million kilometers, 8.3 light minutes - Distance from the sun to earth (this is the amount of time that it takes light to get from the sun to Earth, Dust tail - flows behind the comet's direction of travel forms when sunlight melts particles in the coma., Ion tail - Points away from the sun, Nucleus of a comet - The solid chunk of ice and dust in the center of a comet, Coma of a comet - "Fuzzy" atmosphere around the comet made of melty gasses and dust, Terrestrial planets - Rocky inner planets (most dense) Mercury, Venus, Earth Mars, Gas Giants - planets with deep massive gas atmospheres Jupiter, Saturn, Uranus, and Neptune, Prograde rotation - rotation in the same direction of revolution, Retrograde rotation - rotation in the opposite direction as revolution, Oort Cloud - Spherical region of comets that surround the solar system, Meteoroid - small rocky body that orbits between Mars and Jupiter, Planet - Must orbit a star, and have enough gravity to become a sphere and be big enough to clear away objects form its orbit., Asteroid Belt - Collection of asteroids located between Mars and Jupiter,

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