For some reason, back in the day, the big question was "are aliens real?" now it's not if they're real, it's "where are they?" or "when are they getting here?" I don't know why we have soddenly assured ourselves there are aliens, I don't doubt, NASA has found thousands of planets orbiting stars in known star clusters, Earth sized stars, some they say seem to have a surface completely covered in water. Others have known. Alien planets in movies that have the planets be huge are terrible, the reason why is because a planet has to be the right size, other wise, it has too strong of a gravitational pull, pulls in too many gases, becomes an even bigger gas giant. Too little of a planet doesn't have a strong enough atmosphere, becomes a plant like the moon.