ちょう新星 しんせい残骸 ざんがいじゃありませんでした
chōshin sei zangaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 超新星残骸

1. Was not a supernova remnant.; It wasn't a supernova remnant.

Past/Perfective
Negative
Polite
Terminal Form
Astronomy