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A _________________ is an instrument used to observe distant objects.
telescope
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A day is the time it takes Earth to make one _____________________.
rotation
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A ______________ is a burning ball of gases.
star
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A ________________ is a space object made of ice, dust, and gases.
comet
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A year is the time it takes Earth to make one ____________________.
revolution
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The path a planet takes around the sun is its ______________.
orbit
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An _____________ is a rocky object that orbits the sun in a path between Mars and Jupiter.
astoroid
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A __________________ is a group of planets and their moons that orbits a central star.
solar system
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Any object orbiting another object is a _______________________.
satellite
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The four planets nearest the sun are called the _____________________.
inner planets
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An ________________ is an imaginary line around which a planet rotates.
axis
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The five planets that are farthest from the sun are called the________________.
outer planets
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The moon seems to have different _____________________ as it orbits around the Earth.
phases
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A ________________________ is a vehicle sent into space in order to explore places too dangerous or too far away for people to visit.
Space probe
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A large object that moves around a star is a _______________.
planet
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Planets that are large spheres made up mostly of gases are called _________________________.
gas giant
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Name the inner planets
Mercury Venus Earth and Mars
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Name the outer planets
Jupiter, Saturn, Uranus, Neptune, and Pluto
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Name the planets in order from the sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto
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Compare planets, comets and asteroids
They all revolve around the sun
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