PV Gap

June Said:

What would happen if scientists had discovered an extra-solar planet that has signs of life in its atmosphere?

We Answered:

I think you have the makings of a good short story.

As an abstract answer (to your rather abstract question), imagine if you were a Native American at the time when Europeans came to America. How did that turn out?

So if those aliens were conquerors, there's probably nothing we could do.