observing the solar system
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Kepler discovered that the orbit of each planet is a ____ rather than a circle.
ellipse
an earth-centered system of planets is known as a ____ model
geocentric
the sun-centered system of planets developed by Copernicus is an example of a_____ model
heliocentric
and object's _____ tends to keep a moving object continuing in a straight line and a stationary object in place.
inertia
Astronomy
known as the study of the universe
Johannes Kepler
laws of planetary motion
Nicholas Copernicus
a sun-centered universe
Ptolemy
an earth-centered universe
Isaac Newton
the laws of gravity
Galileo Galilee
turning a telescope to the sky
