| A | B |
|---|
| electromagnetic spectrum | the range of wavelengths or frequencies over which electromagnetic radiation extends. |
| Frequency | The number of complete waves that pass a given point in a certain amount of time |
| ultraviolet radiation | a type of energy that comes to Earth from the Sun, can damage skin and cause cancer, and is mostly absorbed by the ozone layer |
| infrared radiation | a form of energy with wavelengths that are longer than visible light, allows us to see heat signatures of various celestial objects |
| visible light | electromagnetic waves that you can see |
| radio waves | Electromagnetic waves with the longest wavelengths and lowest frequencies |
| Photon | A particle of electromagnetic radiation with no mass that carries a quantum of energy |
| Spectroscope | An instrument that separates light into a spectrum using diffraction |
| gamma rays | Electromagnetic waves with the shortest wavelengths and highest frequencies |
| vacuum | A space where no particles of matter exist |
| Hubble Telescope | A telescope that observes and sends back visible light images of objects in the most remote regions of the universe |
| telescope | A device built to observe distant objects by making them appear closer using light waves |
| medium | Material through which a wave travels |
