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发现了颗银河系外的行。

They are thought to travel to Earth from other galaxies and extragalactic sources.

他们被认为是从其他系和系外的来源来到地球的。

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

研究人员说，还需要更多的数据来证实这是颗真正的" 系外系外行" 。

Its properties challenge our understanding of  extragalactic astronomy.

其特性挑战了我们对系天文学的理解。

Maybe for now, let's exclude the background imaging of cosmic extragalactic polarization instruments.

许暂时，我们不谈及宇宙外银河系极化背景成像仪器。

The analysis is based on some of the first NIRCam datasets observed and released over extragalactic fields.

分析基于些最早发布的近红外相机数据集，这些数据集观测了河外领域。

In galactic and extragalactic astronomy, the star formation rate is significant number.

在银河系及河外天文学中，恒形成率是要数值。

The missing satellite problem, also known as  the dwarf galaxy problem, is one of the most important puzzles in extragalactic astronomy.

失踪卫问题，又称矮系问题，是银河系外天文学中最要的谜题之。

The future of extragalactic astronomy appears promising in the James Webb era.

在詹姆斯·韦伯时代，银河外天文学的未来显得充满希望。

This technique is the gold standard in determining extragalactic distances.

这项技术是确定河外距离的金标准。

So the spectroscopic redshift is the gold standard for determining extragalactic distances.

因此，光谱红移是确定河外距离的金标准。

We have published a detailed video on Webb's  top discoveries so far, from the solar system to stellar astrophysics and from exoplanets to  extragalactic astronomy.

我们发布了段详细介绍韦伯迄今为止大发现的视频，内容涵盖了从太阳系到恒天体物理学， 再到系外行和超银河系天文学的各方面。

Finally, all far-ultraviolet to far-infrared extragalactic  photons, including light from stars, active-galactic nuclei, and other objects,   represents the extragalactic background light.

最终，所有来自远紫外线到远红外线的河外光子，包括恒、活动系核和其他天体发出的光线，构成了河外背景光。

Additionally, there are extragalactic cosmic rays  that may come from even more distant and powerful sources in the universe, such  as quasars and active galactic nuclei.

此外， 还存在来自宇宙中更为遥远且能量更强的天体，如类体和活动系核等， 这些可能就是河外宇宙射线的源头。

Another clue that made the case of an extragalactic origin stronger was that these bright, point-like bursts were not concentrated on the Milky Way's plane.

另让外银河起源案例更有力的线索是，这些明亮的点状爆发并没有集中在银河平面。

So the first question that needed an answer was that were these signals coming from within the Milky Way or did they have an extragalactic origin?

所以第需要解答的问题是这些信号是来自银河系内部还是具有外起源？

Understanding the evolution of stars is critical for studying galactic and extragalactic astronomy, and these studies on supernovas will undoubtedly lead to exciting results.

理解恒的演化对于研究银河系和河外天文学至关要，而这些关于超新的研究无疑将带来令人兴奋的结果。