Earth - the third planet from the sun and the only planet known to have liquid water and life. It is a large, rocky, round planet with land, water, and air, that orbits the sun once a year. The Earth also rotates on its axis, causing day and night, Mercury - the smallest terrestrial planet; rocky with no moons or rings, Venus - a terrestrial planet with a dense, hot atmosphere of sulfuric acid and CO, making it the hottest , Mars - a terrestrial planet; half the size of Earth, thin CO atmosphere and a cold, cratered surface with volcanoes and canyons, Jupiter - largest planet "Giant", Great Red Spot , Uranus - ice giant, known for tilt and long seasons, Saturn - second-largest planet, prominent rings and low density, Neptune - most distant planet; blue ice giant, Sun - a burning star in the center of the solar system, comet - cosmic snowballs of frozen gases, rock, and dust that orbit the Sun, asteroid - rocky body smaller than a planet that orbits the Sun, meteor - "a shooting star" a streak of light seen when a meteroid heats up in the Earth's atmosphere, meteoroid - small rocky or metallic fragments of an asteroid, comet, or planet, meteorite - meteor fragment that reaches the Earth's surface/ground, inner planets - Mercury, Venus, Earth, Mars, outer planets - Jupiter, Saturn, Uranus, Neptune, gravity - force of attraction between any two objects with mass, inertia - resistance of any physical object to any change in its state of motion,

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