That's because scientists don't know for sure if they've identified an extragalactic exoplanet.

这是因为们不确定他们是否现了一颗银河系外。

The researchers say more data will be needed to confirm the observation as an actual " extragalactic exoplanet" .

研究人员说，还需要更多数据来证实这是一颗真正" 系外系外" 。