Across
- 3. Higher frequency (Visible or Infrared)
- 7. Something that causes or helps a reaction to occur, but is not itself consumed as part of the reaction
- 9. A push or pull in any direction
- 11. The rate of change of velocity of a moving object.
- 13. Branch of Science dedicated to the study of everything in the universe above Earth’s atmosphere
- 15. Causes day and night for Earth
Down
- 1. Region of the electromagnetic spectrum with the longest wavelength
- 2. The gravitational force exerted on you by Earth (or the planet on which you happen to be standing)
- 4. The distance that light travels in one year
- 5. Gravitational bound collection of a large number of stars. The Sun is a star in the Milky Way Galaxy.
- 6. founded theory that light moves at a constant speed
- 7. Appearance of the Moon (or a planet) when less than half of the body’s hemisphere is visible from Earth
- 8. A glowing ball of gas held together by its own gravity and powered by nuclear fusion in its core
- 10. The apparent path of the sun around the Earth
- 12. The 12 constellations on the celestial sphere through which the Sun appears to pass during the course of a year
- 14. Distance moved per unit of time