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5 Written questions

5 Matching questions

  1. The chemical makeup of a star's surface is usually inferred by
  2. 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 will
  3. According to Newton's laws, a for must be acting whenever
  4. Why were Newton's three laws so important to astronomy?
  5. A perfect circle is an ellipse with an eccentricity of
  1. a the direction of an object's motion changes.
  2. b move steadily toward the red end of the spectrum.
  3. c Newton's laws showed that planets can move around the Sun by themselves forever, without coming to rest.
  4. d spectroscopy of the light emitted by the star.
  5. e zero.

5 Multiple choice questions

  1. at all wavelengths, with a peak at one particular wavelength (color).
  2. its synodic period.
  3. The air molecules scatter blue light better than red light, so more blue light reaches our eyes.
  4. distance that light travels in one year.
  5. time needed for half the radioactive atoms in the sample to decay.

5 True/False questions

  1. In the 1860s, James Clerk Maxwell carried out important investigations on the nature of light when hedemonstrated that white light was made up of colors that could be split by a prism and that these colors were not produced by the glass through which the light passed.


  2. The declination of a star in the sky is defined as the angle between thecelestial equator and the star, measured along a great circle passing through both celestial poles.


  3. In the geocentric model of the solar system developed by Ptolemy, the planets movein circular epicycles while the centers of the epicycles move in circular orbits around the Earth.


  4. If a modern astronomer describes a faint star as being in the constellation Cygnus, the Swan, you know that the star iscelestial equator and the star, measured along a great circle passing through both celestial poles.


  5. The term retrograde motion from a planet refers to thetemporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.


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