Read “Lucifer’s Hammer”.
I have. I used to be big into science fiction and fiction. I've read "Footfall," "Rendezvous with Rama," "Starship Troopers," "The Songs of a Distant Earth," "The Prometheus Crisis," "The Ten Thousand," (Harold Coyle) "Team Yankee," "Cauldron," all of Tom Clancy's stuff up through "Executive Orders" and "Rainbow Six" but not much after that. As a young boy I read the trilogy "The White Mountains" "The City of Gold and Lead" and "The Pool of Fire." Left an impression on me that I can remember them these many decades later.