Bulldog redux
There's a small chance that we're all alone in the Milky Way, but there's no chance that we're all alone in the milkyway.
nineteenthly
We don't know whether we are or not. My suspicion is that there are plenty of worlds with microbial life and very few with complex life, partly due to natural disasters such as gamma ray bursts and asteroid strikes, and partly because the steps leading to complex life are cumulatively improbable.
jeffdanielk
We don't know. But it is likely that we are not alone. There are trillions of planets.
tham153
The aliens are waiting for civilization to appear on Earth
Starrysky
The aliens don't like your shotgun aiming, DICK.