Astronomy+Test+Study+Guide

**Astronomy Test Study Guide**

astronomy, day, month, year, telescope, optical telescope, refracting telescope, reflecting telescope, focal point, objective lens, electromagnetic spectrum, nonoptical telescope, constellation, astrolabe, zenith, horizon, altitude, celestial sphere, vernal equinox, ascension, declination, ecliptic, red-shift, blue-shift
 * Be able to define the following terms:**


 * Answer the following questions:**
 * 1)  Compare Ptolemy and Copernicus's views of the universe.
 * 2)  Describe how Newton's theories explain why planets orbit the sun and why moons orbit planets.
 * 3)  Compare optical and nonoptical telescopes.
 * 4)  Compare refracting and reflecting telescopes.
 * 5)  Explain why reflecting telescopes are better than refracting telescopes.
 * 6)  What limits the size and magnification of a refracting telescope?
 * 7)  Describe how BOTH refracting and reflecting telescopes work.
 * 8)  Discuss how the atmosphere interferes when trying to view an object through a telescope.
 * 9)  Why do we send most telescopes out into space?
 * 10)  What is the advantage of lining radio telescopes?
 * 11)  How is a constellation like a state?
 * 12)  What is an astrolabe used for?
 * 13)  Explain what you need to know in order to determine an object's altitude in the sky?
 * 14)  Why is it necessary to have different constellation maps for different times of years and for different hemispheres?
 * 15)  Why is the celestial sphere a better way to indicate the position of a star than using altitude?
 * 16) <span style="font-family: Verdana,Geneva,sans-serif; font-size: 130%;"> Why can circumpolar stars be seen all night long during the entire year?
 * 17) <span style="font-family: Verdana,Geneva,sans-serif; font-size: 130%;"> What is the apparent path of the sun across the celestial sphere called?
 * 18) <span style="font-family: Verdana,Geneva,sans-serif; font-size: 130%;"> What is the difference between red-shift and blue-shift?
 * 19) <span style="font-family: Verdana,Geneva,sans-serif; font-size: 130%;"> What do red and blue shifts tell you?
 * 20) <span style="font-family: Verdana,Geneva,sans-serif; font-size: 130%;"> How did Edwin Hubble discover that the universe is expanding? Explain the evidence that he used and how he formed his conclusion.