a rogue planet is heading towards Earth!
whatever shall we do?
luckily (f0r some) the rogue planet Alpha is traveling with a smaller rogue planet, Beta; and there is a chance that when Alpha collides with and pulverizes Earth, Beta may stabilize into a solar orbit near the former Earth.
the game is on: spaceships must be built, and passenger lists determined – very few Earthlings will get passage, what about the rest? and will the would-be-colonists be able to leave Earth before the Collision?
When Worlds Collide was written in 1933 and it has been a major influence in sci-fi writing, in comic books, in movies, to this day.