Dense?
The CLOSEST star to us is Proxima Centari, which is 4.2 light years away.
If aliens exist, they likely don't know we exist.
And if they did, they would have no way to reach us with any spacecraft.
Considering that the universe is humongous, wouldnt you think they have the same exact mindset as we do when we think we're not the only ones here? Maybe they won't know the earthlings specifically but they should be aware that there are other living things out there the same way we do.
Plus there's no way we can even know any of this stuff, for all we know they can be sloth-hybrids who are a million years ahead of technology.
Devie...
What gives you the idea that they aren't already here?
and THIS.. Although there was never really a solid hardcore proof that there are aliens here, so I'm not gonna say there are any but if there are..
well damn.