恒星 こうせい かん航行 こうこうじゃありませんでした
kōsei kankō kōja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 恒星間航行

1. Was not interstellar travel.; Wasn't interstellar travel.

Past/Perfective
Negative
Polite
Terminal Form