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5 Written questions

5 Matching questions

  1. What is the main reason for using several radio telescopes together as an interferometer?
  2. The best shape for the cross-section of a simple astronomical mirror in order to produce the sharpest images of very distant objects at its prime focus is a(n)
  3. In the system of celestial coordinates that matches latitude and longitude on the Earth, which in the coordinate that is equivalent to latitude?
  4. The chemical makeup of a star's surface is usually inferred by
  5. In the 1860s, James Clerk Maxwell carried out important investigations on the nature of light when he
  1. a proved mathematically that light could b described by oscillating electric and magnetic fields.
  2. b parabolic shape.
  3. c to obtain much better angular resolution or sharpness in the images.
  4. d spectroscopy of the light emitted by the star.
  5. e declination

5 Multiple choice questions

  1. path traced out by the Sun in our sky over one year against the background stars.
  2. time needed for half the radioactive atoms in the sample to decay.
  3. Yes, On a summer night many of the constellation you can see are different from the constellations you can see on a winter night. But there are some constellations you can see all year long.
  4. celestial equator and the star, measured along a great circle passing through both celestial poles.
  5. opposition.

5 True/False questions

  1. The position of an element in the periodic table is directly related to thetemporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.


  2. The zero point of the celestial coordinate known as right ascension is defined to be thepoint where the Sun crosses the celestial equator moving northward in its path across the sky.


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


  4. According to Kirchoff's law, the continuous spectrum of light from a hot star, after passing through a cool gas cloud,shows absorption features where light has been absorbed by the atoms of the cool gas.


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