The Doppler method allows astronomers detect planets around other stars by observing what?
a. the light from the planet that is moving towards the star
b. the light from the planet that is orbiting around the center of mass
c. the light from the star that is wobbling around the center of mass
d. the light from the star that is moving away from the planet
Ans.
The correct option is (D) since astronomers measure the wavelength shifts by analysing the light from star which is moving towards the earth or away from the earth (or any planet). Hence option (A) is incorrect. since planet does not have its own light, option (B) is incorrect.
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