The Long Cosmos by Terry Pratchett

In a universe where stepping between alternate Earths is possible, humanity receives a mysterious message from the stars, urging them to "join us." This call to adventure propels a journey across the vast expanse of the Long Earth, as explorers, scientists, and ordinary people grapple with the implications of a cosmic invitation. As they venture further into the unknown, they encounter new worlds, face existential challenges, and confront the very essence of what it means to be human in a multiverse teeming with possibilities. The narrative weaves together themes of exploration, cooperation, and the boundless curiosity that drives humanity to seek its place among the stars.