銀河 ぎんが系外 けいがい星雲 せいうんだったら
gingakeiga iseiu ndattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 銀河系外星雲

1. If it were the galactic nebula; If it were a galactic nebula

Tara Conditional
Astronomy