Across
- 5. The light and energy that come from the sun.
- 8. The measure of how far an object's orbit is from being circular.
- 9. A measure of how hard it is to stop a moving object.
- 10. An object that orbits a star, is large enough to be nearly spherical(round) in shape, and has no other objects in its orbital path.
- 11. The planets in our solar system--Jupiter, Saturn, Uranus and Neptune--that have thick atmospheres and don't have solid outer layers.
Down
- 1. a stretched-out circle
- 2. An attractive force that exists between all objects that have mass
- 3. The tendency for objects in motion to resist changes to their direction and speed
- 4. The amount of material contained in an object, such as gas or dust.
- 6. A measurement of how compact an object is.
- 7. A group of planets and other objects that revolve around a star.
