Have aliens visited Earth? US Congress doesn't rule it out

And any signals originating from civilizations on those planets are incredibly weak and difficult to detect.Could it be aliens have crashed on Earth and the US government is just covering it up, as Republican Congressman Tim Burchett claimed in his reaction to the hearing?For airlines belonging to the International Air Transport Association, the chance of a plane crash is about one in a million. The near-Earth environment should be constantly buzzing with aliens.With radars constantly scanning space, billions of mobile phone cameras, and hundreds of thousands of amateur astronomers photographing the sky (as well as professional astronomers with powerful telescopes), there should be a lot of really good evidence in the hands of the general public and scientists – not just governments.It’s much more likely the UAPs presented in evidence are home-grown, or due to natural phenomena, we don’t yet understand.In science, Occam’s Razor is still a great starting point; the best explanation is the simplest explanation consistent with the known facts.