| A | B |
|---|
| blue-violet | shortest wavelength of light |
| red | longest wavelength of light |
| photon | small packet of light energy |
| ultraviolet (UV) radiation | causes sunburns |
| radio waves | longest wavelenth in the EM spectrum |
| Gamma rays | shortest wavelength in the EM spectrum |
| wavelength | distance between peaks in a wave |
| red shift | star is moving away from Earth |
| blue shift | star is moving toward Earth |
| nuclear fusion | powers the Sun and stars |
| Product of nuclear fusion | helium |
| sunspots | cooler areas on the Sun |
| Conditions where nuclear fusion occurs | high temperature and high pressure |
| spectrum of a star | determines chemical composition |
| Doppler effect | associated with high speeds |
