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Earlier generations of stars in the galaxy could well have had planets. But really, there was only hydrogen and helium to work with, so they'd all be gas giants and not small, rocky planets.

We all come from our own little planets. That's why we're all different. That's what makes life interesting.

When I was a little kid, we only knew about our nine planets. Since then, we've downgraded Pluto but have discovered that other solar systems and stars are common. So life is probably quite prevalent.

We have spoken of beings so low in the scale that the individuals throughout their whole existence are not sufficiently specialized to be distinctively plant or animal: yet these are definite life in simpler shape.

If there are other worlds elsewhere in the universe, I would conjecture they are governed by the same laws of natural selection.

If this is the only planet on which not only life, but intelligent life, has arisen, that would be very unusual.

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.

'Star Trek' was an attempt to say humanity will reach maturity and wisdom on the day that it begins not just to tolerate but take a special delight in differences in ideas and differences in lifeforms.

Super-Earths are how we call a family of planets... up to two times larger and about ten times more massive than the Earth.

It's more fun to think that there are other worlds.