The problem is every one is looking for ships and creatures of a similar size to what we are used to
...now if aliens visited Earth they would be well evolved, probably (as we will) have eliminated all other life forms on their own planet because of similar mistakes to those we currently make with our planet..they would no doubt embarked on tampering with the natural evolution of their species to breed smaller each generation so that resources can go further
.I mean a litre of petrol goes a long way if your cars and people are "ant" size or smaller
.. in fact I expect that they will be so small that they could park their space ship in an ants nest so we never get to see them....being small is sortta inteligent and if they can get here they must be that
....I am sure I am right and that no one ever sees aliens because of this inescapable fact
they are simply too small to be noticed
...prove me wrong
.
alex