Across
- 5. found in or taking place outside the solar system
- 6. The increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other
- 7. a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity
Down
- 1. a planet outside our own Solar System
- 2. a star with the group of heavenly bodies that revolve around it
- 3. The measurement of the intensity, brightness, or other properties of light
- 4. the measurement of the positions, motions, and magnitudes of stars.