El Encuentro by Frederik Pohl

In a gripping tale of unexpected alliances and cosmic mysteries, a group of astronauts embarks on a mission to explore a distant planet, only to encounter an alien species with advanced technology and enigmatic intentions. As they navigate the challenges of communication and cultural differences, the crew must confront their own prejudices and fears, ultimately discovering that the true nature of the encounter holds the potential to reshape humanity's understanding of the universe and its place within it.