Our Evolving Universe
Self Test 7

1. If we could look at the Milky Way Galaxy from outside, the Sun would be
   1. in the disc, near the centre
   2. in the disc, but far from the centre
   3. out of the disc and far from the centre
   4. out of the disc, but quite close to the centre
   
   
2. Stellar clusters are located
   1. in the disc
   2. away from the disc
   3. in the disc if they are globular clusters, away from the disc for open clusters
   4. in the disc if they are open clusters, away from the disc for globular clusters
   
   
3. As seen from the Sun, globular clusters move much more quickly than nearby disc stars because
   1. the Sun's orbit is similar to other disc stars but different from globular clusters
   2. globular clusters are closer to the centre of the Milky Way
   3. globular clusters are further from the Sun
   4. globular clusters are much more massive than single stars, so they have to move faster to counteract the pull of gravity
   
   
4. The stars of the spiral arms
   1. are lower in heavy elements than the Sun
   2. are not part of the disc
   3. are typically much younger than the Sun
   4. more than one of the above
   
   
5. We believe that the centre of the Galaxy harbours a supermassive black hole because
   1. stars near the centre move as if they are orbiting a very large mass
   2. all galaxies have central supermassive black holes
   3. the centre of the Galaxy is a radio source
   4. most of the Galaxy's mass is dark matter

out of 5.

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