至今为止，美国宇航局的“新世界地图册”上只列出了不到1000颗已确认的系外行星。这个数量很小，要知道光是银河系的恒星数量就以亿万计。
To date, NASA's New Worlds Atlas lists fewer than a thousand confirmed exoplanets, quite a small number considering the billions of stars in our galaxy alone.
至今为止，美国宇航局的“新世界地图册”上只列出了不到1000颗已确认的系外行星。这个数量很小，要知道光是银河系的恒星数量就以亿万计。
To date, NASA's New Worlds Atlas lists fewer than a thousand confirmed exoplanets, quite a small number considering the billions of stars in our galaxy alone.
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