Question: Which two methods can be combined to determine an extrasolar planet's density? A) Doppler and astrometric observations B) Astrometric and gravitational lensing observations C) Doppler

Which two methods can be combined to determine an extrasolar planet's density? A) Doppler and astrometric observations B) Astrometric and gravitational lensing observations C) Doppler and gravitational lensing observations D) Doppler and transit observations

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