| A | B |
|---|
| telescope | a device that makes distant objects appear to be closer. They collect and focus light and other forms of electromagnetic radiation. |
| electromagnetic radiation | energy that can travel through space in the form of waves |
| visible light | one of many types of electromagnetic radiation in forms of heat, radio waves, etc.) |
| wavelength | distance between the crest of one wave and the crest of the next wave |
| spectrum | light that spreads out to make a range of different colors with different wavelengths: red, orange, yellow, green, blue and violet |
| optical telescope | a telescope that uses lenses or mirrors to collect and focus visible light. Types: refracting and reflecting telescopes |
| refracting telescope | uses convex lenses to gather and focus light |
| convex lens | a piece of transparent glass, curved so that the middle is thicker than the edges |
| reflecting telescope | uses a curved mirror to collect and focus a large amount of light onto a small area |
| radio telescope | devices used to detect radio waves from objects in space |
| observatory | is a building that contains one or more telescopes. |
| electromagnetic spectrum | includes the entire range of radio waves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays |
