SETI (Search for Extraterrestrial Intelligence) is an organization
dedicated to listening for signals from other intelligent life. If
we’re right that there are 100,000 or more intelligent
civilizations in our galaxy, and even a fraction of them are
sending out radio waves or laser beams or other modes of
attempting to contact others, shouldn’t SETI’s satellite array
pick up all kinds of signals?
But it hasn’t. Not one. Ever.
Where is everybody? […]
The Great Filter theory says that at some point from pre-life to
Type III intelligence, there’s a wall that all or nearly all
attempts at life hit. There’s some stage in that long evolutionary
process that is extremely unlikely or impossible for life to get
beyond. That stage is The Great Filter.
If this theory is true, the big question is, Where in the
timeline does the Great Filter occur
It turns out that when it comes to the fate of humankind, this
question is very important. Depending on where The Great Filter
occurs, we’re left with three possible realities: We’re rare,
we’re first, or we’re fucked.