If one day an asteroid is discovered on a collision course with Earth, and we have an idea of how big the asteroid is and how fast its coming and when it will hit, that kind of information.
A tailed comet on a collision course with Earth might possibly be detected early enough for a successor to dart, stationed in outer space, to rush in and push it out of harm's way.
Luna 25 crashed in August because its engine failed to shut down correctly while it was manoeuvring into a pre-landing orbit, putting it instead on a collision course with the Moon.
This made her a revered, almost saintly figure to her East German readers; at the same time, her consistently uncertain, questioning tone put her on a collision course with the socialist leadership.
The addition of so much new territory also inadvertently set the north and south on a collision course with each other that would end a decade later with Civil War.
The story starts on August 25th when the Wall Street Journal ran a front page story saying that Libya and the United states were once again on a collision course.