| A | B |
|---|
| reflecting telescope | Telescopes that use mirrors to collect and focus light |
| refracting telescope | Telescopes that use convex lenses to collect and focus light. |
| space telescope | Telescopes in orbit above Earth's atmosphere |
| radio telescope | Radio antenna that collects radio waves or microwaves |
| electromagnetic radiation | Energy transmitted through space as a wave |
| wavelength | Horizontal distance from wave crest to wave crest, or wave trough to wave trough |
| electromagnetic spectrum | Full range of electromagnetic radiation |
| frequency | Number of wavelengths that pass a given point every second |
| Where were telescopes developed? | Italy |
| Who invented the Telescope | Galileo Galilei |
| Why are most telescopes refracting telescopes? | It’s much easier to precisely make mirrors than to precisely make glass lenses |
| Why do scientists need space telescopes? | To study Space |
| frequency | Number of wavelengths that pass a given point every second |
| light-year | Distance that light travels in one year; 5.9 trillion miles, 9.5 trillion kilometers. |
| visible light | Portion of energy in the electromagnetic spectrum that is visible to humans.visible lightPortion of energy in the electromagnetic spectrum that is visible to humans. |
| What type of waves have the shortest wavelengths? | Gamma Rays |
| What type of waves have the longest wavelengths? | Radio Waves |
| What type of waves have the lowest frequency? | Radio Waves |
| What type of waves have the shortest frequency? | Gamma Waves |
| What is the visible light region? | 400 nanometers (nm) through red at 700 nm. |
