Astronomy 1021 Lecture Notes - Lecture 6: Galilean Moons, Table Tennis, Momentum

• School: Western University
• Department: Astronomy
• Course: Astronomy 1021
• Professor: Robert Cockcroft

Document Summary

Second law: planets move faster in their orbits when they"re closer to the sun. Third law: more distant planets move more slowly doubts still remained. Aristotle: said if earth was moving then birds, falling stones, and clouds would be left behind. Stellar parallax ought to be detectable if earth orbits the sun. Experiments and observations that overcame the major objections to the. Showed experimentally that moving objects remain in motion unless a force acts to stop it. So birds, stones, and clouds should stay with earth. Galileo used the telescope to show that they were not perfect. Mountains and valleys on the moon (not a perfect sphere) Galileo used his telescope to see that the band across the sky that we refer to as. If stars are very far away, then lack of visible stellar parallax is not a problem. Discovered four large moons orbiting jupiter proved that not all objects orbit the.