Across
- 2. A unit of measurement used to describe distances between celestial objects, equal to 3.258 light years
- 5. Energy radiated in the form of a wave, resulting from motion of electric charges and the magnetic fields they produce
- 6. A group of stars that appear to form a pattern in the night sky
- 9. The brightness of a star
- 10. The average distance between the Earth and the Sun, about 150 million kilometers
- 11. The distance that light travels in one year, about 9.5 trillion kilometers
- 12. The measure of how bright a star appears to be to an observer on Earth
- 13. A variable star that brightens and dims regularly, or pulses, and whose distance can be determined from its period of pulsation
Down
- 1. Continuous spectrum spectrum crossed by dark lines, produced when light passes through a nonincandescent gas
- 3. Spectrum consisting of individual lines at characteristic wavelengths produced when light passes through an incandescent gas; a bright-line spectrum
- 4. A continuum depicting range of electromagnetic radiation, with the longest wavelength at one end and the shortest at the other
- 7. Spectrum that contains unbroken band of all colors or wavelengths
- 8. The measure of how bright a star would be if it were located 10 parsecs from Earth