The Doppler effect is used to discover extrasolar planets.
多普勒效曾用于发现太阳系外行星。
extrasolar planetary system.
其他行星系
The search for extrasolar planets has been going on for 32 years.
寻找太阳系以外的星球已经进行三十二年了。
Three undergraduate students, from Leiden University in the Netherlands, have discovered an extrasolar planet.
来自荷兰莱顿大学的三名本科生已经发现了太阳系外行星。
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