Consider this. If there is any life evolving on those planets by the time they reach the level we're at now their astronomers will see a super nova in their sky. It will be our sun exploding and vaporising the earth. Of course in the meantime we can invade their planet, exterminate them all with our high tech death rays, and then move in.
Well, actually, they won't see our Sun become a supernova. It isn't massive enough. If it had been massive enough from the very start to run all the way through helium, carbon, oxygen, neon, magnesium and silicon fusion, we wouldn't be here talking about it because  it would have been a Type O supergiant with a radius greater than the current radius of Earth's orbit, and  it would have used up its hydrogen stocks in around 10 to 20 million years, which means it would have entered the supernova phase long before basic abiogenetic processes could have led to the first protocells. Always assuming of course that there existed a planet in orbit around such a hypothetical Type O "Sun" at the right distance for those processes to begin that had managed to accrete and cool down to the right temperature in just 10-20 million years, which is again unlikely.
What will happen is that the Sun will expand its envelope as hydrogen stock are depleted, move on to helium fusion at the core, then shed a large part of its mass in a so-called 'planetary nebula' before settling down to a long, slow end as a white dwarf. However, this won't happen for another 5 billion years.