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thought that the sun was the center of the universe and that Earth and all planets orbit the sun.
thought that the sun and the moon rovolved around the Earth and that all other planets revolved around the sun.
thought that all planets revolved around the sun in eliptical orbits and that the sun was not in the exact center of the orbits - also stated three laws of planetary motion.
showed that all objects in the universe attract each other through gravitational force.
an instrument that collects electromagnetic radiation from the sky and concentrates it fo better observation.
the point where the rays of light that pass through the lens of that reflect from a mirror converge.
a region of the sky that contains a recognizable star pattern and that is used to describe the location of objects in space
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