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.
Copernicus died the same year his book was published. After 1,400 years, Copernicus was the first to propose a theory which differed from Ptolemy's geocentric system, according to which the earth is at rest in the center with the rest of the planets revolving around it. he word helios in Greek means sun.. Heliocentric means that the sun is at the center. A heliocentric system is one in which the planets revolve around a fixed sun. Thus Mercury, Venus, the Earth, Mars, Jupiter and Saturn all revolve around the sun.