Space Capstone Crossword

5. the force that binds one object to another
6. an idea that placed Earth at the center of the solar system instead of the Sun
7. an idea that places the Sun at the center of the solar system
9. the study of space
11. a system composed the interplanetary medium, dark matter, and celestial bodies
12. the total amount of matter in an object
14. one of the four periods on Earth that begins with a solstice or equinox and usually has different weather
16. all the contents of space, time, matter, stars, and other cosmic objects
18. the movement of an object as it pivots about an axis
19. a torus-shaped region of asteroids that divide the inner and outer planets

1. an imaginary line that runs down the center of an object to depict its center of rotation
2. the phase of the Moon where the illuminated part that faces Earth gets smaller
3. elliptical, spiral, and irregular
4. the mission where Neil Armstrong and Buzz Aldrin first landed on the Moon
8. the natural satellite of the Earth that takes about a month to orbit Earth
10. the rising and falling of the sea due to the gravitational attraction of the planets
13. the measure of the force of gravity on an object
14. a method of reducing measurements to achieve the same proportions as the scale model
15. the distance that light travels in a year
17. an optical instrument that allows distant objects to appear brighter and clearer