Planet characteristics - PowerPoint PPT Presentation

CRCT Question

CRCT Question. When the solar system first evolved it was composed of primarily hydrogen and oxygen. hydrogen and helium. helium and nitrogen. hydrogen and carbon dioxide. Corny joke of the Day. Why can’t a nose be 12 inches long? Because then it would be a foot!. March Madness.

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The Solar System

The Solar System. Historical Perspective. Ptolemy (90 – 168 A.D.). Developed system that allowed him to predict location of planets . Planets on small circular orbitals, called epicycles . Geocentric solar system – Earth was center of orbits. System used until 16th century.

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