Pg.+28-29

Paige H. Pg 28-29

1.
 * r ****eflecting telescope:** a telescope that uses curved mirrors to gather and focus light
 * refracting telescope:** a telescope that uses a set of lenses to gather and focus light

2. ** c ****elestial equator:** an imaginary circle created by extending Earth's equator into space
 * horizon:** line where the sky and the Earth "meet"

3. **x** **rays:** a form of electromagnetic radiation, similar to light, but of shorter wavelengths and capable of penetrating solids and of ionizing gases
 * microwaves:** an electromagnetic wave with a wavelength between that consisting of infrared and short waves

4. **r****ight ascension:** measure of how far East an object is from the point at which the sun appears on the first day of spring
 * declination:** measure of how far North or South an object is from the celestial equator

5**.** **l****eap year:** a year that occurs every four years, where an extra day is added to the calendar
 * light year:** a unit of length that is equal to the distance that light travels through space in a year

6.b.

7. c. 8. a. 9. b. 10. a. 11. d. 12. 13. 14. 15.

20.