| A | B |
|---|
| electromagnetic spectrum | all the different types of electromagnetic waves |
| spectrum | range of colors formed by light passing through a prisim |
| radio waves | longer than waves of visible light |
| gather and focus visible light | reflecting and refracting telescopes are designed to___ |
| mirrors | what reflecting telescopes use to direct and focus light |
| objective lenses | what refracting telescopes use to direct and focus light |
| temperature and chemical composition | what spectrographs tell astronomers about a star |
| light-year | the distance light travels in one year |
