Considering the probability of other life in the universe, if it exists, attempting to contact us.....
How many species exist on this one planet?
How many of them are capable of transmitting an interstellar signal or eventually traveling to another star system?
So if life exists on other planets, what are the odds it's intelligent enough to care about communicating with us or traveling to our planet?
If other life exists but doesn't excede the intelligent level of monkies, how will we know?
And considering we're the only intelligent species on this planet, what if it was a one in a billion fluke? And there's only 300 billion to 500 billion stars in our galaxy... It does't seem to far fetched to me that we could be the only intelligent ones.
