Hmmm, I'm sure this has prolly been discussed in detail in the past, but here goes anyway.

Do you think that we are alone in this universe, or cosmos? If not, Do you think that there are more advanced societies than us? If there are more advanced civilizations, have they contacted us? On a similar note, do you think they are waiting for a certain time when we have discovered interstellar space travel, or some other advanced technology before contacting us?

Taken from the motion picture Contact.
If we are alone, it seems to be an aweful waste of space.