惑星 わくせい かん物質 ぶっしつじゃありませんでした
waku seikambusshitsujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 惑星間物質

1. Was not interstellar matter.; Was not an interstellar substance.

Past/Perfective
Negative
Polite
Terminal Form
Astronomy