Why Do We Say That the Doppler Technique Gives the Planet's

question 31

Multiple Choice

Why do we say that the Doppler technique gives the planet's "minimum mass"?

• A)The size of the Doppler shift that we detect depends on whether the planet's orbit is tilted.
• B)The size of the Doppler shift that we detect depends on knowing the star's mass,which can be very uncertain.
• C)Extrasolar planets are always increasing in mass.
• D)Doppler measurements are very difficult,producing noisy data that often cause astronomers to underestimate a planet's mass.

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Definitions:

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A labor union that represents workers in the automobile, aerospace, and agricultural implement manufacturing industries in the United States.

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