1.What proportion of visible stars in the night sky are
Question and Solution
1.What proportion of visible stars in the night sky are multiple-star systems?A.about 25%, or 1/4B.less than 1%C.nearly
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1.What proportion of visible stars in the night sky are multiple-star systems?
A.about 25%, or 1/4 B.less than 1% C.nearly 100% D.about 50%, or 1/2
2.Which important stellar parameter can be determined by the study of binary stars?
A.the age of the stars B.stellar masses C.surface temperatures of the stars D.the distance of the stars from Earth
3.Dark matter cannot be seen, but we can detect its presence by its
A.strong radio emissions. B.strong emissions in the near infrared. C.gravitational influence on visible stars. D.accretion disk.
4.What fraction of the mass of our galaxy appears to be in the form of dark matter, which we cannot see but can detect through its gravitational influence?
A.about 50% B.0%. All matter can be seen. C.about 90% D.about 10%
5.The rotation curve of a galaxy is a graph showing the galaxy's speed of rotation at different distances from the center. The observed rotation curve in the outer parts of a typical large spiral galaxy
A.decreases suddenly to zero at the outer edge of the visible galaxy. B.decreases smoothly with increasing distance from the center, following a Keplerian curve. C.is quite flat (roughly the same speed at all distances). D.increases drastically with increasing distance from the center, as shown by the spiral arms.
6.How do we know how much mass each of the planets have?
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