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5 Written questions

5 Matching questions

  1. When Saturn is closest to the Earth, it is at
  2. If a modern astronomer describes a faint star as being in the constellation Cygnus, the Swan, you know that the star is
  3. In the 1860s, James Clerk Maxwell carried out important investigations on the nature of light when he
  4. One difference between violet light and red light is that
  5. In the system of celestial coordinates that matches latitude and longitude on the Earth, which in the coordinate that is equivalent to longitude?
  1. a somewhere within a particular region of sky having definite boundaries.
  2. b opposition.
  3. c proved mathematically that light could b described by oscillating electric and magnetic fields.
  4. d Right ascension
  5. e violet light has a shorter wavelength than red light.

5 Multiple choice questions

  1. shows absorption features where light has been absorbed by the atoms of the cool gas.
  2. elliptical orbit, with the Sun at one focus.
  3. temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.
  4. zero.
  5. visible light, UV radiation, X rays, gamma rays

5 True/False questions

  1. One light-year is thedistance that light travels in one year.


  2. The ecliptic can be defined as thepath traced out by the Sun in our sky over one year against the background stars.


  3. In the geocentric model of the solar system developed by Ptolemy, the planets movecelestial equator and the star, measured along a great circle passing through both celestial poles.


  4. The Copernican system for planetary motion isare 88 in number and cover the entire sky.


  5. Why was adaptive optics developed?The air molecules scatter blue light better than red light, so more blue light reaches our eyes.