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Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

We can never prove that we're alone in the universe. But the Allen Telescope Array could prove that we're not.

I believe that we're not alone. How can we be alone in an infinite universe? I'm using the word 'alien' with a little trepidation because I know that sparks so many different versions of that word, and there are so many different images that come into one person's head when someone says it.

Just as the individual is not alone in the group, nor any one in society alone among the others, so man is not alone in the universe.

We are never the same with others as when we are alone. We are different, even when we are in the dark with them.

For each one of us stands alone in the midst of a universe.

As human beings, we need to know that we are not alone, that we are not crazy or completely out of our minds, that there are other people out there who feel as we do, live as we do, love as we do, who are like us.

The universe is almost 14 billion years old, and, wow! Life had no problem starting here on Earth! I think it would be inexcusably egocentric of us to suggest that we're alone in the universe.

Personally, I do not know whether humankind is alone in this vast universe. But I do know that we should cherish our existence on this precious speck of matter... the greatest gift that could be bestowed upon us. For all practical purposes, there is only one planet Earth.

Perhaps the thing that makes humans truly unique on Earth is that we are never satisfied with our situation; maybe that is what's taken us so far.