Questions on Celestial Coordinate System Essay

4837 WordsDec 10, 201320 Pages
1. As seen from temperate or tropical latitudes, the positions of the constellations shift gradually westward in the sky from night to night because (a) the Earth rotates on its axis. (b) the Earth revolves around the Sun. (c) the tilt of the Earth’s axis changes. (d) their right ascensions constantly change. (e) their declinations constantly change. 2. A star cluster in which the individual stars do not show a striking central concentration nor an orderly pattern or structure is called (a) a thin cluster. (b) an open cluster. (c) a nebulous cluster. (d) a globular cluster. (e) a random cluster. 3. An average star such as our Sun will, it is believed, eventually end up as (a) a blue dwarf. (b) a…show more content…
(b) globular clusters. (c) blue dwarfs. (d) neutron stars. (e) red giants. 14. In an electromagnetic field, the direction of wave travel (propagation) is (a) parallel to the magnetic lines of flux. (b) parallel to the electrical lines of flux. (c) parallel to both the magnetic and the electrical lines of flux. (d) parallel to neither the magnetic nor the electrical lines of flux. (e) dependent on the wavelength. 15. The elevation of an object in the sky is its (a) angle in degrees with respect to the zenith. (b) angle in degrees with respect to true (geographic) north. (c) angle in degrees with respect to the meridian. (d) angle in degrees above the horizon. (e) distance in kilometers from the Earth. 16. Long-distance space travel will require (a) an advanced or even an as-yet unknown propulsion system. (b) patience and cooperation among the spacecraft crew. (c) a means of replenishing or maintaining food, air, and water supplies. (d) a shelter against stellar and cosmic radiation. (e) all of the above. 17. Dust storms on Mars (a) are too small to be seen by Earth-based telescopes. (b) occur only near the poles. (c) never last more than a few hours. (d) sometimes cover the whole planet. (e) do not occur. Mars has no atmosphere and therefore no wind. 18. On

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