Multiple-planet systems have been identified around other stars via the Doppler technique.

Name: Multiple-planet systems have been identified around other stars via the Doppler technique.
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The Doppler technique, also known as the radial velocity method, can detect the presence of multiple planets in a star system by measuring the variations in the star's movement caused by the gravitational pull of the planets. Many such systems have been discovered.

Multiple-Planet Systems Have Been Identified Around Other Stars Via the Doppler