For my two bobs worth, simple maths and probability tells us we are almost certainly not alone in the universe.
However, keeping in mind the distances involved, whether they'd go to all the trouble of travelling all this way over here at all, let alone to see us without bothering to make it absolutely clear they'd arrived, is a bit unlikely IMO.
And I understand they'd probably have different technology that might make distance not an issue. But if that were the case they'd be here all the time - right? I mean, if we wanted to know about the moon and it were only in the next suburb, we'd be there having a squiz and sucking it dry in no time.
Just my 2c worth
