PV Gap

Willie Said:

What do you think of this hypothesis about aliens visiting us on earth?

We Answered:

I think that your idea of a large community starship that travels on a one-way trip for many generation to reach another star is very realistic. I believe that someday people will actually do this. It is so difficult to accelerate a ship up to even a fraction of the speed of light that an interstelar journey would take thousands of years.
Aliens might be doing this now but I don't see any evidence that any asteroids are spaceships.
By the way, there was a Star Trek episode in the original series based on exactly your idea: a spaceship made to look like an asteroid.