Why Is It Easier to Use Doppler Shifts to Discover

question 2

Multiple Choice

Why is it easier to use Doppler shifts to discover binary stars than to discover planets orbiting other stars?

• A)The orbital periods of binary stars are longer than those of planets
• B)The Doppler shifts are very small in the case of planets
• C)For planets the shifts are so large they shift the lines out of the visible
• D)Stars orbited by planets do not generally show spectral lines

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