image credit: X51 cc
After years of speculations - as well of years of pretty much everyone knowing about it although everyone in power denied it - the U.S. government released a classified document confirming that Area 51 is a real government testing site. As for crashed UFOs and alien autopsies? Not so much.
The report states that the secret U-2 testing is what lead directly to the reports of UFO sightings in the area, especially since the U-2 flew at 60,000 feet, far above the height that other planes of the time regularly flew. That solves that. Unless this is the government trying to misdirect us because they have an actual spaceship and a pile of gray alien corpses stored away under there.