Well, I just used 65 million as an example and Earth is 4.5 billion years old and there are much older planets. My point is that galaxy's size and age make factors other that possibility of FTL travel more important to the whole question. Factors like probability of multicellular, sapient life developing and sustaining itself long enough to colonize space.
Well, I just used 65 million as an example and Earth is 4.5 billion years old and there are much older planets. My point is that galaxy's size and age make factors other that possibility of FTL travel more important to the whole question. Factors like probability of multicellular, sapient life developing and sustaining itself long enough to colonize space.