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Sir Isaac Newton gave the extraterrestrials their biggest shot in the arm when he embraced the infinite universe as the basis for his hugely influential system of physics. Even so, the aliens of the early modern period remained creatures of philosophy rather than science.

I prefer to speak of 'interdimensionals' rather than 'extraterrestrials' because the latter has connotations of 'little green men' and all the other cliche responses. Nor does it tell the full story.

I believe that there may be intelligent life on other planets.

For many centuries, humans have speculated that there might be planetary systems around other stars and that there could be extraterrestrial life there and even intelligent being. However, those were simply speculations, and now we have evidence for the first part of these ideas.

The idea that there could be other universes out there is really one that stretches the mind in a great way.

Clearly, unless thinking beings inevitably wipe themselves out soon after developing technology, extraterrestrial intelligence could often be millions or billions of years in advance of us. We're the galaxy's noodling newbies.

Another random thing I do is the search for extraterrestrial intelligence, or SETI. And you may be familiar with the movie 'Contact,' which sort of popularized that. It turns out there are real people who go out and search for extraterrestrials in a very scientific way.

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.

The fancy that extraterrestrial life is by definition of a higher order than our own is one that soothes all children, and many writers.

There is a very large chunk of our population who firmly believe in extraterrestrials.