A similar book is „The Sparrow“ by Mary Doria Russell - humanity catches a radio signal of signing from another planet 4 light years anway and, since it’s so cl

A similar book is „The Sparrow“ by Mary Doria Russell - humanity catches a radio signal of signing from another planet 4 light years anway and, since it’s so close, they send a delegation. The main character is a Jesuit linguist priest and he learns the languages spoken there