When Worlds Collide (1933) novel and movie (1951)

I remember reading as a teenager Edwin Balmer and Philip Wylie's 1933 novel When Worlds Collide and being frightened by it. In their scenario, rather than Planet X (Nemesis or Niburu), which is hypothesized as being part of our solar system, another planet they call Zyra comes careening into our solar system and smacks into the Earth. Some resourceful people manage to build a spaceship and launch themselves to get away.

I didn't think the sequel, After Worlds Collide (1934) was half as good.

A movie, When Worlds Collide, was released in 1951. I saw it many years after first reading the novel and did not think it as good.