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15 cards from this deck
System with the Sun at centre
Eight
Pluto and Ceres
Milky Way
Rock
Gas
Strong gravitational fields attract debris
Earth at centre of universe
Earth orbits Sun faster than Mars
Moons orbiting Jupiter
Planets orbit in ellipses, not circles
Gravitational force
Velocity always changing
Increases (to maintain stable orbit)
Moons that orbit planets
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