The simple answer is almost always correct. Good luck figuring out which one it is. What is more likely:

1. An alien civilization so advanced, it can travel an unimaginable distance to visit the earth and can barely stay hidden from our primitive technology.
2. Government research that is so advanced it looks like alien technology, who can barely keep any secrets from the everyday public.
3. The Elite, Private Corporations with near-unlimited funding, who can control what you are told to believe is true, what is "misinformation", what is best for you.