To be honest, were probably gonna end up destroying ourselves before this question is ever answered.
Plus while im not expert, there really is a very slim chance that we are alone in the universe. plus to those people saying that these races would have evolved along with us under the same timeframe, thats utter crap.
earth is approx 4.7 bil years old. but the universe is 13.7. just because humans only started roaming this planet a few million years ago certainly doesnt mean that this is the same for every planetary body in the universe. some planets could have formed quite quickly after the big band and evolution could have kicked off much earlier. Plus id imagine if there was an extra terrestrial civilization out there, they wouldnt hvae had thousands of years of religious repression against sciences, so their technology even if they did evolve with us would be far superiour than ours, so no, we would be screwed if they were hostile







