Across
- 3. is visible to the human eye
- 5. measure of how closely packed matter is, expressed in grams/ cubic centimeters
- 6. the visual shift slightly back and forth each year of the stars, based on where we are viewing it from either side of earth's orbit
- 8. radiation, also known as heat radiation, refers to the radiation that has wavelengths longer than
- 10. period, the period of time that it takes an object to spin on its axis once
- 11. unit, a unit of distance, AU, which is based on the average distance between the earth and sun
Down
- 1. radiation, the name for invisible wavelengths of light
- 2. satellites, refers to the four largest moons of Jupiter, named for the person who discovered them
- 4. refers to how long a light wave is
- 7. a process where a large atom, such uranium, fissions of breaks into smaller atoms, releasing a lot of energy
- 9. smaller atoms combining into larger atoms, creating energy