Across
- 4. a distence measured not in time but in length
- 5. equivalent to one joule per second and equal to the power in a circuit
- 6. The number of occurrences of a repeating event per unit time
- 9. How bright the star maybe
- 10. Highest point of the wave
- 11. ball of gas in space
- 13. the heliocentric parallax of a star
Down
- 1. Lowest point of the wave
- 2. one crest, one trough
- 3. gamma rays having a wavelength of 0.001 angstrom to long waves having a wavelength of more than 1 million KM
- 5. How fast the wave goes
- 7. an illuminating agent or source, as the sun, a lamp, or a beacon.
- 8. The brightness of a star
- 12. the distance measured between the waves