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3.1 Vocabulary

Across
a measure of the amount of matter that makes up an object; a property of matter
a body that orbits the sun, is massive enough for its own gravity to make it round, and has cleared out smaller objects around its orbit; there are eight planets in our solar system
to travel in a circle around an object
all knowledge gained from experiments
a relationship between events or things, where one is the result of the other
the smallest piece of matter that has the properties of an element; a combination of three subatomic particles: protons, neutrons, and electrons
a force of attraction between all matter
Down
the size, extent, or importance (magnitude) of something relative to something else
everything that has mass and takes up space
a push or pull that acts on an object, changing its speed, direction, or shape
a collection of planets and other objects that orbit a star
the gravitational force exerted on an object by a planet or moon
something that happens in a regular and repeated way