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TRAVELING TOGETHER AROUND THE SUN
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The path of an object as it revolves around another object in space
orbit
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external
outer
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Center of the earth
core
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to travel around a new, unknown place to see what it is like
explore
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inside
inner
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The length of a path between two points
distance
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Anything that has mass and takes up space
matter
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a spacecraft that carries scientific instruments that can collect data, but has no human crew
space probe
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A scientist who studies the stars and other objects in the sky
astronomer
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(adj.) one of a kind; unequaled; unusual; found only in a given class, place, or situation
unique
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objects, such as those in space or on Earth.
bodies
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A straight line passing from side to side through the center of a circle or sphere.
diameter
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A large round pit caused by the impact of a meteoroid.
craters
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the outside layer; the top
surface
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A force that pulls objects toward each other
gravity
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