With Our Current Techniques, Astronomers Can Typically Only Measure the Minimum

question 31

Multiple Choice

With our current techniques, astronomers can typically only measure the minimum mass of a planet orbiting another star. To know the precise mass of the planet, they must also be able to determine

• A) the age of the star
• B) the angle at which the planet's orbit is tilted relative to us
• C) whether the planet has any moons
• D) the time the planet takes to make one orbit
• E) the language the planet's inhabitants speak, so we can ask them

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