Models of the Solar System Crossword Puzzle

QUESTIONS LIST:

• earth : most ancient astronomers thought that all celestial objects revolved around _ .
• greek : ge is the _ word for “earth."
• four : galileo discovered _ moons around jupiter.
• motions : ptolemy’s model explained the _ observed in the sky fairly accurately.
• galileo galilei : people became convinced that the heliocentric model is correct after evaluating evidence collected by _ _ .
• geocentric : earth is at the center of the revolving planets and stars in a(n) _ model.
• kepler : the fact that each planet’s orbit is an ellipse was discovered by _ .
• venus : the heliocentric system gained support when galileo observed that _ goes through phases similar to those of earth’s moon.
• tychobrahe : in the late 1500s, ptolemy’s observations were supplanted by those of _ _ .
• helios : _ is the greek word for “sun."
• copernicus : the arrangement of the known planets and how they move around the sun was first worked out by nicolaus _ .
• ellipse : a(n) _ is an oval shape, such as the planets’ orbits.
• sun : in a heliocentric system, earth revolves around the _ .