Pg.+23


 * Paige H. Pg. 23**

1. One way in which refracting telescopes are similar to reflecting telescopes is that they both gather and focus light, but a way they are different is that, to do this, refracting telescopes use lenses, and reflecting telescopes use mirrors.

2. Earth's atmosphere causes starlight to shimmer and blur. Light population from large cities can make the sky look bright, which limits an observer's ability to view faint objects in the sky. Astronomers solve this problem by placing telescopes in dry areas to avoid water vapor in the air. Mountaintops are good places to use telescopes because the air is thinner in higher elevated areas. 3. //Electromagnetic Wavelengths:// Electromagnetic waves are blocked by the Earth's atmosphere. Scientists have put out special telescopes to detect those blocked waves. The types of telescopes used are ultraviolet telescopes, gamma-ray telescopes, and x-ray telescopes.