Intelligence a goal of evolution?

[MotRod]

I've had this thought many times in the past and it popped in there again tonight so I needed to get it out.

Fact : Out sun is going to die in one of several ways, all of which will kill all life on this planet.
Conclusion from this : If life on this planet it to continue to evolve, it will need to be intelligent.
It will need to know it cannot live here forever. It will also need to figure out how to get somewhere else.

Reasoning : as far as I have logic'd out, an unintelligent biological organism won't adapt an ability to travel to another habitable planet through Darwinian evolution.
Not impossible, but the numbers don't strike me as good. I don't see reinforcement? What would encourage a mutation that could evolve to get a reproductive vessel to another system with enough time to reinforce that mutation?

Selection requires a positive reinforcement on the survival rate of the offspring with the mutation.
What could reinforce an unintelligent organism that the mutation that got its seed out of the atmosphere and to another system was a good thing?

I guess reinforcement would be they survive longer than their sun and colonize other systems?
That is a pretty crazy being from a human perspective. That would take quite a long time.

I may have this all wrong, maybe there need not be reinforcement for Darwinian evolution. I am not very well read in that area.

I need to come back to this.