Extragalactic nebula is invisible to the naked eye.

我们用肉眼是看不到河外星系的。

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"The claim that it's extragalactic is kind of a guess," says Pravdo.

“这颗行星来自外星系的说法只是一种猜测，”普拉夫多说。

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"The claim that it's extragalactic is kind of a guess," says Pravdo.

“这颗行星来自外星系的说法只是一种猜测，”普拉夫多说。

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