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15 cards from this deck
Sun (1 star), 8 planets, dwarf planets, moons
Sun at the centre of the solar system
Pluto and Ceres
Milky Way galaxy
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Rock
Gas
Strong gravitational fields attract debris
Earth at centre of universe, everything orbits Earth
Mars' retrograde motion (apparent backwards motion)
Moons orbiting Jupiter
Ellipses, not perfect circles
Gravitational force causing constant direction change
Increases
Increase (to maintain stable orbit)
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