ninth planet
第九行星
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Solar System's ninth planet?
太阳系的第九颗行星？
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Researchers are now pretty certain there's a ninth planet in the solar system.
研究人员如今相当确定，太阳系中存在着第九颗行星。
No one knows for sure, but it is probably about 140 degrees below zero Celsius on this ninth planet.
没有人确切知道，但估计这第九个行星上的温度大约是摄氏零下140度。 收藏。
Alan Stern, who's the lead scientist on this mission, says there are bound to be other surprises in store regarding the ninth planet from the sun.
NPR: NASA Sends Spacecraft to Pluto
Still, by his ninth decade on planet Earth, Armstrong seemed to be more relaxed in public and generally more visible than he used to be.
CNN: Neil Armstrong, a hero who shunned fame
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