Summary: Physics 306, Honors Astronomy, Exam 2
You are graded on your work, with partial credit where it is deserved.
1. We discussed 6 basic methods for determining distances to objects in astronomy, 3 of which involved
"standard candles" and 3 of which involved other techniques. Below, pretend that you are describing each of
these 6 methods to a family member or friend who knows nothing about astronomy, and who will look at
you quite skeptically unless you are absolutely clear about how the method works.
I.e., the score on the question depends on how clear and convincing your description is. Draw a picture if it
2. Again pretend that you are explaining to a skeptical family member or friend who knows nothing about
astronomy. This time describe in a couple of sentences what is meant by each of the following features in a
spiral galaxy. For a visible part, say something about the nature of the stars found there.
(a) (3) dark matter halo
(b) (3) halo (meaning visible halo with stars)