It's debatable, but many people would point at It or perhaps The Stand. It's a matter of personal taste, though.
"The Stand: The Complete & Uncut Edition."
Kings' first published novel was Carrie.
Aliens from outer space, called "Greys" in the novel/movie.
for me it has to be Stephen kings IT
Yes, Penny Dreadful was the name of the clown in Stephen Kings IT
The book "Skeleton Crew" was a short fiction of a second collection. Which written by Stephen King and, later incorporated into the novel 1987 novel "The Tommyknockers". Including a poem written for Stephen Kings' son.
Stephen Morris - novel - was created in 1961.
Steven Kings best ever selling novel was Carrie, the story of a high school girl who, after being made fun of at the prom, comes back with supernatural powers and takes her revenge.
Stephen King's novel "It" was originally published by Viking Press in 1986. The following year it was published in mass market paperback by Penguin Group Incorporated.
The ISBN of Titan - Stephen Baxter novel - is 0002254247.
The ISBN of Rage - Stephen King novel - is 978-0451076458.
Titan - Stephen Baxter novel - has 581 pages.
Moonseed - Stephen Baxter novel - has 500 pages.