Space Science

6. time it takes a planet to complete one full rotation on its axis
9. he formulated the law of universal gravitation
11. it is this season in Australia in June
13. when the area of sunlight is at a maximum in one hemisphere and at a minimum in the other hemisphere
14. the earth-centered model of the solar system
16. an event during which one object in space casts a shadow onto another
18. the darkest part of the shadow
19. this scientist proposed the heliocentric model of the solar system
20. smaller bodies that orbit most of the planets
21. __________ force is the inward force that causes an object to move in a circular path
24. the word that scientists use to describe space and all of the energy and matter in it
27. the beginning of planets
29. a ________ moon appears to grow
31. this scientist proposed the geocentric model of the solar system
33. the lighter outer cone of the shadow
35. a body that orbits a larger body
36. the Milky Way is this type of galaxy
37. tidal cycles occur _____ minutes later each day
38. month when it is our winter solstice
39. these orbit between Mars and Jupiter; made of rock and/or metal
42. the spinning of a body, such as a planet, on its axis
44. the Earth, sun and moon are all _______ up during spring tide
45. areas where very little matter exists

1. the force of attraction between objects
2. a ________ moon appears to shrink
3. this side is illuminated when the moon is waning
4. the time it takes Earth to complete one full revolution around the sun
5. his first principle states that planets move in elliptical orbits
7. point when a planet is farthest from the sun
8. the sun-centered model of the solar system
10. these are often called “shooting stars”
12. an example of a gas giant planet; farthest from the sun
13. characterized by a pattern of temperature and other weather trends
15. the motion of a body that travels around another body in space
17. when sunlight shines equally on the Northern and Southern hemispheres
22. a spherical body that orbits the sun
23. an example of a terrestrial planet; closest to the sun
25. a large celestial body that is composed of gas and emits light
26. tides that have the smallest daily tidal range
28. these are made of ice, dust and gas; most are found in the Oort Cloud or Kuiper Belt
30. a large collection of stars, gas and dust
32. point when a planet is closest to the sun
34. a lunar eclipse will only occur on a ______ moon
40. tides that have the largest daily tidal range
41. daily changes in the level of ocean water
43. the path that a body follows as it travels around another body in space