Part of the purpose of the UFOs is to debunk human science.
Using science to study them is like using fish to study bicycles.
I suspect that if there are alien craft here - piloted or autonomous drones - they couldn’t care less about human kind. If they were interested, they would have made their presence known long ago.
From what we can tell from our limited understanding of celestial bodies, liquid water is reasonably rare. A planet that surface is covered by 70% liquid water may be exceedingly rare. If they’re here, that’s probably what they’re interested in.