The orbital speed of a star about the center of the Milky Way is determined by its distance from the galactic center and the amount of galactic mass within its orbital distance. The orbital speed of our sun is about 220 km/s. It is possible to observe a nearby star moving with a speed (observed by us) in which of the following ranges: I. 10 - 40 km/s II. 100 -300 km/s III. 1000 km/s A. I, II and III B. I and II C. I only D. II only

The orbital speed of a star about the center of the Milky Way is determined by its distance from the galactic center and the amount of galactic mass within its orbital distance. The orbital speed of our sun is about 220 km/s. It is possible to observe a nearby star moving with a speed (observed by us) in which of the following ranges: I. 10 - 40 km/s II. 100 -300 km/s III. 1000 km/s A. I, II and III B. I and II C. I only D. II only

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Question

I. 10 - 40 km/s

II. 100 -300 km/s

III. 1000 km/s

A. I, II and III

B. I and II

C. I only

D. II only

Is the answer C?

Orbital speeds in our solar system decrease with distance from the Sun. I am not sure if this still holds for the nearby star.

Thanks!

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