銀河 ぎんが系内 けいない星雲 せいうんでしょう
gingakei nai seiundeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 銀河系内星雲

1. Probably within the Milky Way.; Possibly a nebula within the galaxy.

Polite
Presumptive
Conjecture
Astronomy