Given our sun is set to red giant, that earth will become uninhabitable, and unable to support life, how is evolution a valid theory if it's thought that life will no longer continue?
"Therefore," says the professor, tapping the calculations she's written on the blackboard, "the sun will consume the earth in fifty billion years' time."
A student leaps up and screams "What? What?"
The professor taps the blackboard and says "Fifty billion years!"
The student sits down again. "Oh thank god! I thought you said fifteen billion."
Actually the sun is about 4.6 bn years old and is good for another 5 bn years or so.
So, bearing in mind that humans have only been around for about 200,000 years, and civilized for about 12,000 years. we have some time to figure out our options. Given 5 bn years we might be able to make new suns and planets.
Or even new universes, who knows?
Or of course we may wipe ourselves out instead.
We have plenty of time to do either.
As for the evolution part, if we're stuck on Earth, then we'll either evolve a bit or fail to evolve a bit ─ the larger the population, the larger the chance that any mutation, beneficial, neutral or detrimental, will simply be reabsorbed towards the norm.
If we want to travel to the stars then we'll need to work out how to travel faster than light, which at the moment looks Very Hard.
Or we might replace ourselves with intelligent humanoid machines capable of traveling interstellar distances ─ Homo sapiens mechanicus.
What will happen? Stay tuned!