Astronomy Review Unit 2

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Across
  1. 2. orbital motion law that describes how planets orbit in ellipses at a foci
  2. 4. took Brahe’s catalog and used it to create his 3 Laws of Orbital Motion, also did a lot of research into optics and how light moves through lenses.
  3. 6. orbital motion law that describes that planets move equal areas over equal times
  4. 7. type of motion which explains how planets appear to move backwards due to the Earth passing the planet's orbit
  5. 9. Model that has the Earth at the center of the universe with the sun, moon, and planets orbiting the Earth.
  6. 10. First to publish the heliocentric model, his model had flaws such as perfect orbits
  7. 12. Model that has the sun at the center of the universe with all the planets orbiting the sun.
Down
  1. 1. unit that measures the average distance from the Sun to the Earth
  2. 3. created the three laws of motion
  3. 5. first to explain that the heavens can change and proved that comets were not in the atmosphere, he created a hybrid model that had the sun and moon orbiting the Earth, but all the planets orbiting the sun.
  4. 8. the measure of how close an orbit is to a complete circle, 0 means completely circular
  5. 9. Improved on the telescope to make the best telescopes of his time. Pointed the telescope to the sky and discovered Jupiter's moons, rings of Saturn, and mountains on the moon
  6. 11. orbital motion law that describes that the square period of a planet’s orbit is inversely related to the cube of its average distance from the sun