Since the U.S. government has more or less admitted these exist, I guess they're not /x/ anymore.
So what the hell are they? Literal space vehicles? Why would aliens visit us instead of sending robot probes? Why do they prefer to stay hidden, but not *that* hidden? Basically, what's their fucking problem?
So what the hell are they? Literal space vehicles? Why would aliens visit us instead of sending robot probes? Why do they prefer to stay hidden, but not *that* hidden? Basically, what's their fucking problem?