There are no extra-terrestrials. Maybe there is life there but they aren't flying around in ships or crafts coming here to Earff. What we are experiencing has more to do with Occult and Black Magic then visitors from outer space.
From the pyramids to Atlantis to Stone Henge to the Ancient Alien theory to Rosewell to Area 51 to the Phoenix Lights what we are seeing are the Nephillim as described in the book of Genesis. Fallen Angels. Demons. They possess technology because they are all knowing. They are indigenous to this planet and can, in fact travel in space but not like we think. They know how to bend dimensions and travel through them.
Remember; They will be used as the Final Card to bring a one world government which will bring a one world "religion" which will usher in the Beast Himself to wage war on God's people.