Homesmind

This is the story of Anra and her people, who have been given the ability to communicate telepathically by the Wanderer, a comet controlled by the cybernetic intelligence called Homesmind. When another comet/planet arrives it threatens to destroy them by seducing them with visions of dead loved ones and dreams that no one wants to awake from. I read this book many years ago as a young teenager and found it fascinating. It was one of the first science fiction books I had ever read and I've been hooked ever since.