惑星 わくせい かん航行 こうこうじゃありませんでした
wakuseikankō kōja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 惑星間航行

1. Was not interplanetary travel.; Was not a journey between planets.

Past/Perfective
Negative
Polite
Terminal Form