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Upsilon AndromedaeThis was the first multi-planet system ever found. When Debra Fischer and I discovered this three-planet system in our Doppler measurements from Lick Observatory in 1999 we were utterly stunned. To find the first planetary system ever was history before our eyes. Strangely, it has three planets, not just two. So we found a triple-planet system before finding a double-planet system.
(Image: NASA, ESA, and A.?Feild (STScI))
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