SC100 Class 3 Homework Assignment

1. SC100 Class 3 Homework Assignment • 1. What did the builders of Stonehenge accomplish? • a. They demonstrated that some natural events are predictable. • b. They figured out reasons why the Solar System works as it does. • c. They established contact with ancient astronauts. • d. They maintained written records of natural events. • e. They accomplished all of the above.

2. SC100 Unit 3a Homework Assignment • 2. Closely spaced groups of stars that maintain their relative positions in the sky are called • a. constellations. • b. galaxies. • c. meteors. • d. comets. • e. quarks.

3. SC100 Unit 3a Homework Assignment • 3. The Greek astronomers' explanation for the celestial spheres did not encompass the phenomenon of • a. geocentricism. • b. planetary motion. • c. uniform motion. • d. retrograde motion. • e. a & c

4. SC100 Unit 3a Homework Assignment • 4 The Ptolemaic theory of the universe includes • a. an unmoving Earth at the center. • b. an unmoving Sun at the center. • c. elliptical orbits. • d. stationary planets. • e. no explanation about the Sun's movement

5. SC100 Unit 3a Homework Assignment • 5. Copernicus hypothesized that • a. the Sun was the center of the universe. • b. the Earth was the center of the universe. • c. the planetary bodies had circular orbits. • d. a & c • e. b & c