Discovering Gravity #2

6. created the space-time theory stating that the large objects in the universe curve the fabric of space and time around themselves, creating a well that other objects fall into.
8. a description of something that happens in nature, but not why. Scientific laws are based on observations
9. a space that is empty of matter
13. how near something is to something else
14. the blanket of air surrounding the earth
15. a rock or chunk of ice that falls toward Earth from space. Small meteors burn up before they reach Earth, and we see them as shooting stars.
16. a measure of the gravitational pull on an object

1. a gas in the air that people and animals need to breathe to stay alive
2. an object that circles another object in space. Also a device that circles Earth and transmits information.
3. pushes against gravity and affects the speed of something falling down
4. a light gas often used to fill balloons
5. describes something that is tightly packed, such as the matter in an object
7. a ball of ice and dust that orbits the sun
10. a small rocky object that orbits the sun
11. pressed together very tightly, so it takes up less space
12. the concept that time and three-dimensional space act on each other and exist together in a four-dimensional continuum. Also called the space-time continuum.