系外 けいがい惑星 わくせいではありませんでした
keigai waku seidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 系外惑星

1. Was not an exoplanet.; Was not a planetary system outside of our own.

Past/Perfective
Negative
Polite
Formal Register
Astronomy