P7 Quiz: Mapping the universe

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  • Created by: Boma
  • Created on: 23-06-13 22:17

1. What is red-shifting?

  • The change in wavelength of light from a distant star moving away from Earth.
  • The change in wavelength of light from a distant star moving towards Earth.
  • The change in wavelength of light from a close star moving away from Earth.
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2. Who was right in the Curtis-Shapley debate?

  • Curtis: He thought there were many galaxies, 10,000 pc across each, with the Sun at the centre and that nebulae were separate from the Milky Way
  • Neither
  • Both: Shapley was right about the Sun being away from the centre of our galaxy, but Curtis was right about the multiple galaxies and that the nebulae were far away from the Milky Way
  • Shapley: He believed there was one galaxy, 100,000 pc across, with the Sun away from the centre, and that nebulae were part of the Milky Way

3. Parallax is...

  • ...position or direction of an object appears to differ when viewed from different positions
  • ...position or direction of an object appears to not change when viewed from different positions

4. A parsec (pc) is calculated as...

  • 1/parallax angle (arcseconds)
  • 2/parallax angle (arcseconds)
  • 0.25/parallax angle (arcseconds)

5. Speed of recession (km/s) in calculated as...

  • Hubble constant (km s-1 Mpc-1) x distance (Mpc) or Hubble constant (s-1) x distance (km)
  • Hubble constant (s-1) x distance (Mpc) or Hubble constant (km s-1 Mpc-1) x distance (km)
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Comments

zo26blue

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100%, excellent resource, thank you.

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