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5 Written questions

5 Matching questions

  1. The term retrograde motion from a planet refers to the
  2. A perfect circle is an ellipse with an eccentricity of
  3. Which of the following characteristics of an astronomical telescope is the most important for determining the angular resolution?
  4. The time period between two successive passages of a planet through the position of opposition is
  5. The declination of a star in the sky is defined as the angle between the
  1. a its synodic period.
  2. b temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.
  3. c zero.
  4. d celestial equator and the star, measured along a great circle passing through both celestial poles.
  5. e diameter of the objective lens or mirror.

5 Multiple choice questions

  1. to obtain much better angular resolution or sharpness in the images.
  2. to the latitude of the location.
  3. parabolic shape.
  4. energy emitted by each square meter of the star's surface each second.
  5. at all wavelengths, with a peak at one particular wavelength (color).

5 True/False questions

  1. If a modern astronomer describes a faint star as being in the constellation Cygnus, the Swan, you know that the star issomewhere within a particular region of sky having definite boundaries.


  2. An arc second is a measure ofangle


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


  4. Why were Newton's three laws so important to astronomy?Newton's laws showed that planets can move around the Sun by themselves forever, without coming to rest.


  5. When a solid body (or a dense gas such as a star) cools from a temperature of several thousand degrees, the color of the wavelength of maximum emission of radiation willmove steadily toward the red end of the spectrum.


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