The Speed of the Sun in Its Orbit Around the Milky

question 147

Multiple Choice

The speed of the Sun in its orbit around the Milky Way Galaxy is deduced by reference to and observations of

• A) the orbital motions of stars near the Sun.
• B) globular clusters.
• C) Cepheid variables, which provide a distance standard.
• D) the galactic center, about which the Sun is orbiting.

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Definitions:

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