Across
- 2. a small packet of light energy.
- 4. Jupiter, Saturn, Uranus, Neptune.
- 5. the region of the sun that radiates energy to space, or the visible surface of the sun.
- 6. a telescope that reflects light off a concave mirror, focusing the image in front of the mirror.
- 9. a dark spot on the sun that is cool in contrast to the surrounding photosphere.
- 10. includes gamma rays, X-rays, ultraviolet light, visible light, infrared radiation, microwaves, and radio waves.
- 11. Mercury, Venus, Earth and Mars.
Down
- 1. the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer.
- 3. the study of the properties of light that depend on wavelength.
- 7. a telescope that uses a lens to bend or refract light.
- 8. the outer, weak layer of the solar atmosphere.
- 12. a cloud of gas and/or dust in space.