Somebody call Dan Rather!
The question isn't "do they exist?" The question is what are they?........and from what dimension do they come?...What solar system?.......what galaxy? One might also ask, What are they doing here?......that's the easiest one to answer. They are explorers. We're a laboratory for them.
Not that this calculation matters very much, but Einstein once wrote that given the estimated billions of stars and orbiting planets around each one, the smallest number of spheres similar to our Earth, which could support life would be 600+
And for the strictly Bible-oriented people, if God created the Universe, then "what can not God do?" Who would argue that everything in the Universe is barren, including all planets around every one of billions of suns, and that only planet Earth has life?"
Char:)