Five refugees from an alien planet are traveling to escape some cataclysmic event (not important here). I need them to land on Earth, 65 million years ago. (At this point in time, their technology is, say, 10 millennia ahead of modern human technology.)
The problem is, 65 million years ago, there are only dinosaurs. (The landing of the refugees caused the extinction. It's complicated.) The aliens don't have the technology to see 65 million years into the future (or really, any time into the future). They also do not have the technology allowing them to predict that any sentient life will evolve at any time past their landing.
We want them to land on a planet that will evolve sentient life (or already has it. The reason is not important.) I need them to be on Earth, because the main characters are, well, humans on Earth. However, there are other planets (and probably closer ones than Earth, since the planet of origin is quite far from Earth) which already have developed known sentient life.
What's a plausible reason for them to land on Earth? (Chance is a cheap answer, so I'm not accepting that as an answer.)