Astronomers discover strange twin planets might be water worlds

[PoindexterOglethorpe]

3. This is in part why we have not found other intelligent species.

They might live on a very different kind of planet, such as one which has even less dry land than ours does.

Or their planet might be covered with clouds of some kind (sort of like Venus, but not so hot) and so they have no idea what else is out there.

Or they might be on a planet like Europa, covered by ice, so again they never see the stars.

Or perhaps their vision is quite different from ours and, you guessed, it, never see the stars.

And that's not even thinking about the very distant chance that two civilizations would overlap in time and actually be close enough to make contact.