The Sun revolves around the center of the Milky Way Galaxy (Fig. 5–49) at a distance of about 30,000 light-years from the center (1 ly = 9.5 × 1015 m). If it takes about 200 mil- lion years to make one revolution, estimate the mass of our Galaxy. Assume that the mass distribution of our Galaxy is concentrated mostly in a central uniform sphere. If all the stars had about the mass of our Sun (2 × 1030 kg), how many stars would there be in our Galaxy? Sun - 30,000 ly- FIGURE 5-49 Edge-on view of our galaxy. Problem 84.
The Sun revolves around the center of the Milky Way Galaxy (Fig. 5–49) at a distance of about 30,000 light-years from the center (1 ly = 9.5 × 1015 m). If it takes about 200 mil- lion years to make one revolution, estimate the mass of our Galaxy. Assume that the mass distribution of our Galaxy is concentrated mostly in a central uniform sphere. If all the stars had about the mass of our Sun (2 × 1030 kg), how many stars would there be in our Galaxy? Sun - 30,000 ly- FIGURE 5-49 Edge-on view of our galaxy. Problem 84.
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Transcribed Image Text:The Sun revolves around the center of the Milky Way Galaxy
(Fig. 5–49) at a distance of about 30,000 light-years from
the center (1 ly = 9.5 × 1015 m). If it takes about 200 mil-
lion years to make one revolution, estimate the mass of our
Galaxy. Assume that the mass distribution of our Galaxy
is concentrated mostly in a central uniform sphere. If all the
stars had about the mass of our Sun (2 × 1030 kg), how
many stars would there be in our Galaxy?
Sun
- 30,000 ly-
FIGURE 5-49 Edge-on view of our galaxy.
Problem 84.
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