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 .
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 .
