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It's impossible that we're alone in the universe. Every time we think we're more special than others, we're proven wrong.

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.

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

People quite often think of the question 'Are we alone in the universe?' in terms of other civilizations out there: life forms that have reached at least our level of technological development.

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.

We know from science that nothing in the universe exists as an isolated or independent entity.

Perhaps, as some wit remarked, the best proof that there is Intelligent Life in Outer Space is the fact it hasn't come here. Well, it can't hide forever - one day we will overhear it.

We have the notion that we exist but we have no way to prove it. 'I am' is the closest foundation we can get.

Spectroscopy can probably answer the question, 'Is there anybody out there?' Are we alone?

I believe we exist in a multiverse of universes.