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Angela Corrao Science page 28 questions 1-15, 20

1. **Reflecting 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. **Celestial equator-** Imaginary circle created by extending Earths’ equator into space
 * Horizon-** The line where the sky and the Earth appear to 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 of infrared and short waves

4. **Right ascension-** a measure of how far east an object is from the point at which the sun appears on the first day of spring
 * Declination-** A measure of how far north or south an object is from the celestial equator

5. **Leap year-** A year in which an extra day is added to the calendar
 * Light-year-** A unit of length equal to the distance that light travels through space in 1 year

6. B) the rotation of the Earth on its axis 7. C) the Romans 8. A) the Ptolemaic theory 9. B) Galileo 10. B) constellations 11. D) all of the above 12.C) from the zenith 13. C) the moon 14. C) X-ray telescopes 15. D) separate telescopes are needed to observe each type of radiation, but only one of the telescopes must be in space

20. Ray that don't penetrate earth helps us because not all but some of those drays are harmful to us.