[ExI] Silence in the sky-but why?

[BillK]

On Tue, Aug 27, 2013 at 5:41 PM, Adrian Tymes wrote:
<snip>
> If the odds of intelligent, tool-using life with the potential for space
> travel arising around a star, in a given five billion years of the star's
> lifespan, is somewhere around one trillionth (readily justifiable when you
> multiply together all the factors it would need to overcome, even before the
> species gains the capacity to wipe itself out), then we would indeed expect
> there to be exactly one intelligent species by now - and here we are.  Not
> counting anything we create, we could expect on the order of another ten
> billion years before another species like us came along.
>
>

Gadzooks! You mean we are the only intelligent life in the galaxy!

Now that's really frightening.

BillK