Astronomy

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Across
  1. 2. The __ giants include Uranus & Neptune which of lots of icy materials in their atmosphere/surface.
  2. 4. Terrestrial planet covered mostly in liquid water
  3. 5. The smallest planet and the planet closest to the Sun
  4. 10. A band of constellations along the path the Sun appears to travel across the sky over the course of a year.
  5. 12. Unit of distance based on the average distance between Earth and the Sun
  6. 14. Planet nicknamed "The Morning Star" that has a very strong atmosphere
  7. 15. The amount of space between two objects. Gravity weakens exponentially as this increases.
  8. 17. An ice giant that appears to rotate on its side
  9. 21. Term for an object that orbits a planet or other larger body such as a moon.
  10. 22. The scientific study of objects and phenomena in space
  11. 25. The minimum speed needed to escape an object's gravity without additional propulsion is called Escape _____
  12. 26. A region of space where gravity is so strong that not even light can escape (2 words)
  13. 29. The ___ cloud is a spherical region surrounding the solar system containing billions of icy objects & source of many long-period comets
  14. 30. NASA program that sent humans to the Moon
  15. 31. Astronomer who discovered that planets travel in elliptical orbits
  16. 36. The distance light travels in one (Earth) year.
  17. 37. Astronomer who proposed a Sun-centered model of the solar system
  18. 38. The star at the center of our solar system
  19. 41. Saturn's largest moon and the only moon known to have a thick atmosphere
  20. 43. The largest object in the asteroid belt and a dwarf planet
  21. 44. Former Planet. Now Dwarf Planet with highly elliptical orbit.
  22. 47. The approximate time an Object takes to rotate once on its axis (24 hours for Earth)
  23. 48. Astronomer who first spotted Jupiters 4 largest moons, and the phases of Venus
  24. 50. A belief system that attempts to connect the positions of celestial objects with events or human lives
  25. 51. Describes a model with the Sun at the center
  26. 53. The most distant of the eight planets from the Sun, discovered by math.
  27. 54. The force that attracts objects with mass toward one another
Down
  1. 1. The largest moon in our solar system
  2. 3. Saturn's icy moon known for spraying plumes of water into space
  3. 6. A recognizable pattern of stars seen from Earth
  4. 7. The only planet we've successfully landed rovers on.
  5. 8. Planet with the shortest day length and has trojan asteroids in its orbit
  6. 9. The Sun and all of the objects gravitationally bound to it. ____ System
  7. 11. Ringed planet with a hexagonal storm on it's south pole
  8. 13. The time it takes to complete one orbit around the Sun
  9. 16. Astronomer who made extremely precise observations of the planets before the invention of the telescope. He had the pet Moose!
  10. 18. Scientist who developed the laws of motion and universal gravitation
  11. 19. Large planet with no solid surface. Known as ___ Giants like Jupiter & Saturn
  12. 20. A rocky object that orbits the Sun, with most found in belt between Jupiter & Mars
  13. 23. The path an object follows around another object in space
  14. 24. Landing place for the Apollo
  15. 27. The apparent shift in an object's position when viewed from different locations
  16. 28. Describes a model with Earth at the center
  17. 32. Jupiter's icy moon believed to have a liquid ocean beneath its surface
  18. 33. The amount of matter in an object
  19. 34. Neptune's largest moon that orbits in retrograde.
  20. 35. The barred spiral galaxy that contains our solar system
  21. 39. Mercury, Venus, Earth, and Mars are all solid surfaced rocky planets know as this type of planet.
  22. 40. The ___ Belt is a region beyond Neptune containing many icy objects and dwarf planets
  23. 42. The U.S. government agency responsible for space exploration, scientific research
  24. 45. An oval-shaped curve; the shape of planetary orbits
  25. 46. Jupiter's moon known for its extreme volcanic activity
  26. 47. A category of small planetary bodies that includes Pluto and Ceres. ____ Planet
  27. 49. An instrument used to observe distant objects in space. Galileo used one and Newton invented a better one!
  28. 52. Jupiter's heavily cratered outermost large moon