In 2015, the United States Census Bureau estimated that 36.1% of individuals between the ages of 25 to 34 had a bachelors degree, with 36.3% in individuals aged 35 to 44, 32% in individuals 45 to 64, and 26.7% in individuals 65 and older.
Galileo Galilei was the first astronomer to use a telescope to study the heavens. Galileo made a number of observations that finally helped convince people that the Sun-centered solar system model (the heliocentric model), as proposed by Copernicus, was correct.
Epicycles were not a problem to the medievals, because epicycles were perfect circles. In fact, Copernicus' first version of the heliocentric system was a system of no less than thirty-four circles, including epicycles, to describe the motions of just seven bodies around the central Sun. A previous version of this page included the myth that geocentric systems included lots and lots of epicycles.