right, but if you quote someone to support your opinion than he must have credentials
He can not be a "who ist it ? " guy

However I would be curious to see an article or a simulation made by a qualified scientist demostrating that aliens might have visited our earth
I am speaking seriously , I am not ironic

Just to avoid misunderstanding

Tha vast majority of scientists , as far as I know , do not beleive that aliens visited our earth for the reason explained

However many scientists beleive that aliens exist, not necessary super civilizations
The reason being ;

a) Evolution is a deterministic theory
It needs a great deal of chance, of course, but it is deterministic

b) The huge number od planets in the universe