ちょう だい質量 しつりょうブラックホールであれば
chōdaishitsuryōburakkuhōrudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 超大質量ブラックホール

1. If it were a supermassive black hole; When it is a supermassive black hole

Ba Conditional
Astronomy