Astronomy Review

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Across
  1. 2. Unit of time used to describe one complete revolution around the Sun.
  2. 10. The ___ Belt contains chunks of rock that never formed into a planet (thanks, Jupiter!).
  3. 13. He proposed that the Sun was at the center of the solar system.
  4. 14. VERY famous Greek who “borrowed” Eudoxus’s idea.
  5. 15. An ellipse has two of these (which a circle has one); use the fancy plural word.
  6. 17. To be a planet, the IAU says you have to have “cleared the ___.”
  7. 18. Brahe’s assistant who used his data to figure out the Three Laws of Planetary Motion
  8. 19. The imaginary line on which a planet rotates.
  9. 22. Earth’s “twin”; has a runaway greenhouse effect problem.
  10. 23. Made Eudoxus’s geocentric model work a little better by using epicycles (circles on circles)
  11. 27. When a planet spins one time on its axis.
  12. 28. Location when a planet is the closest it will get to the Sun during its orbit.
  13. 29. Term used to describe one complete orbit around the Sun (not a unit of time).
  14. 31. The only place we are 100% sure has life on it.
  15. 33. Name used to describe the large, mostly gas planets outside the asteroid belt (2 words).
  16. 34. Generic name used to describe one object blocking sunlight from reaching another object.
  17. 35. Large belt of icy objects located outside of the orbit of Pluto: ___ Belt.
  18. 38. Name for the two days a year when there are equal hours of daylight and nighttime: Fall or Spring ___. (plural)
  19. 39. Eclipse that happens when the Earth gets in the way of sunlight and turns the Moon red: ___ Eclipse.
  20. 40. Kepler's Second Law says, "Planets sweep out equal ___ in equal times."
  21. 41. Dwarf planet located inside of the Asteroid Belt
  22. 42. Dwarf planet discovered that caused us to rethink the definition of “planet”.
  23. 44. The season when the northern hemisphere (and Iowa) is tilted towards the Sun.
  24. 46. Our only star.
  25. 47. Term used to describe how “oval” is the orbit of a planet.
  26. 48. The severe storm that has been raging for 400+ years in Jupiter’s atmosphere (3 words, no spaces).
  27. 50. Model of the solar system with the Sun at the center.
Down
  1. 1. The Giant ___ Theory is our best explanation for how we got our Moon.
  2. 3. Ancient Greek who said Earth was at the center, surrounded by crystal layers (his idea was “stolen” later on).
  3. 4. Tilted 90° on its axis; it was the first planet discovered that ancient people didn’t know about.
  4. 5. Location when the planet is the farthest away from the Sun during its orbit.
  5. 6. The “king” of the planets because it is the largest.
  6. 7. Got reclassified as a Dwarf Planet thanks to the new definition of “planet” by the IAU.
  7. 8. Agreed with Copernicus but was forced to deny it publically by the Catholic Church
  8. 9. Name of Earth’s only natural satellite.
  9. 11. Scientific term for the oval-shaped orbit created by a planet revolving around two foci.
  10. 12. Unit of time used to describe one complete rotation.
  11. 16. Small, red, and dead; probably had water at one point in the distant past.
  12. 17. Named after the god of the seas because it kind of looks like it is covered in oceans (it isn’t).
  13. 20. Two days of the year with the most and least amounts of daylight. (plural)
  14. 21. Type of an eclipse when the Moon gets in the way of incoming sunlight (2 words).
  15. 24. Unit used to measure distances between planets; Earth’s distance to the Sun is considered one ___ unit (2 words)
  16. 25. Season when the northern hemisphere (and Iowa) are tilted away from the Sun.
  17. 26. Dutch noble with a fake nose; recorded tons of observations, but never did anything with the data.
  18. 30. The true “reason for the seasons.”
  19. 32. Word used to describe the rocky, inner Earth-like planets.
  20. 33. Model of the solar system that says that Earth is at the center.
  21. 36. Unit used to measure the large distances between stars (2 words)
  22. 37. Because the Earth is tilted on its axis, light doesn’t always hit the Earth at the same ___.
  23. 43. Has big, beautiful rings that are the remains of a crushed-up moon.
  24. 45. Smallest planet; moves quickly around the Sun because it doesn’t have as far to revolve/orbit.
  25. 49. The cloud containing trillions of comets at the edge of the Sun’s gravity.