Finally , there was the question of cometary randomness .

最后，还有彗星随机性的问题。

Cometary dust around a dead star .

死亡恒星四周的彗星尘。

Astronomers have always known that the deeper they peek inside a cometary nucleus , the farther they peer back in celestial time .

天文学家一直知道，他们在一个更深的彗星核偷看，越远，他们早在同行天体的时间。

The center carries out a wide variety of research in just some of the following fields of space physics including : space plasma physics ; magnetospheric physics ; ionospheric physics ; atmospheric physics ; and planetary and cometary atmospheric studies .

波士顿空间物理中心在下例空间物理领域开展了多种研究：空间等离子体物理；磁层物理；电离层物理；大气物理；行星和彗星大气研究。

To confirm that comets contributed to the atmosphere , scientists will need to analyze the krypton and xenon isotope ratios in the cometary samples recently captured by nasa 's stardust mission , says geochemist and lead author greg holland , also at manchester .

同是曼彻斯特大学的地化学家、主作者格雷格`霍兰指出，为了确认彗星对大气的贡献，科学家们还需要进一步分析最近由nasa星尘号任务捕获的彗星样本中所含的氪和氙的同位素比率。