Across
- 2. system - a collection of planets and other objects that orbit a star
- 5. the gravitational force exerted on an object by a planet or moon
- 6. a measure of the amount of matter that makes up an object; a property of matter
- 8. a force of attraction between all matter
- 9. to travel in a circle around an object
- 10. the smallest piece of matter that has the properties of an element; a combination of three subatomic particles: protons, neutrons, and electrons
- 11. a relationship between events or things, where one is the result of the other
Down
- 1. something that happens in a regular and repeated way
- 2. all knowledge gained from experiments
- 3. everything that has mass and takes up space
- 4. a body that orbits the sun, is massive enough for its own gravity to make it round, and has cleared out smaller objects around its orbit; there are eight known planets in our solar system
- 7. the size, extent, or importance (magnitude) of something relative to something else
- 12. a push or pull that acts on an object, changing its speed, direction, or shape