Planet - Celestial body moving in an elliptical orbit around a star. , Characteristics of Planets - Size, density, chemical composition, speed, distance from the Sun, Terrestrial Planets - Mercury, Venus, Earth, Mars, Gas Giants - Jupiter, Saturn, Uranus, Neptune, Ice Giants - Term used to classify Uranus and Neptune, Planets with shorter revolutions - Inner planets, Planets with longer revolutions - Outer planets, Gravity - Natural force of attraction exerted by a celestial body on the mass of an object or near its surface., Greater - The ____________ the mass of an object, the more gravitational force that is exerted on a nearby object. , Closer - The _________ two objects are to each other, the more of an influence their gravitational force has. , Elliptical - Shape of the planets' orbits. , Venus - Hottest planet, Counter-clockwise - Direction of the spin of the planets on their axis, except for Venus and Uranus. , Magnetosphere - Deflects harmful electromagnetic rays from the sun. , Jupiter - Home of the Great Red Spot, a massive, continuous storm larger than 2 Earth's. , Iron oxide - Compound in the regolith of the Martian surface, which gives the planet a distinctive red color. , Carbon dioxide - The thick clouds on Venus are made of this compound, which holds in heat. , Weight - Mass X Gravitational Pull , Runaway Greenhouse Effect - The reason behind the high temperatures on the surface of Venus. , Density - The amount of matter (mass) in a specified area (volume)., Saturn - Planet that has such low density it could float in a giant bathtub. , Uranus - Planet with a sideways axis. , Neptune - Home of the Great Dark Spot. , Io - Galilean Moon that is covered in active volcanoes and looks like moldy cheese. , Callisto - Galilean moon that is tidally locked to Jupiter (the same side always faces the planet). , Ganymede - Largest moon in the Solar System. , Europa - Galilean moon that is the focus of the Clipper mission, to learn more about the possible saltwater ocean under this moon's icy surface. ,

Planet Characteristics and Gravity Basics

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