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

这是因为科学家们不确定他们是否现了一颗银河系外的行星。

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

员说，还需要更多的数据来证实这是一颗真正的" 星系外系外行星" 。