The Black Cloud Author:Fred Hoyle Astrophysicists on Earth become aware of an immense cloud of gas that is heading for the solar system. The cloud, if interposed between the Sun and the Earth, could wipe out most of the life on Earth by blocking solar radiation and ending photosynthesis.
This is an excellent book about how professionals and amateurs respond when new astronomical events start being observed. I will reread it one of these days.