I don't know why... I believe we "humans" are "aliens"...
Wait... hold on.
See, I believe a certain ancient civilization once ruled the Earth (e.g Sumerian civilization). These "gods" were what we would call "aliens" from outer space. These aliens found Earth way back in time and found life on it, and wanted to exploit the resources on it. So, what they did is that they mixed their genetic code with one of the species on Earth to carry out their bidding - - perhaps one from the chimpanzee/ape species.
Then, we "were formed". A genetically modified "alien". Thus we begin our roles as slaves. For a long time, it seems fine. Until these "aliens" decide to leave and monitor from time to time the labour work of mining, say, gold for example.
But we grew too quickly. Multipled too fast. We were forming our very own civilization. We formed... the "human race". These aliens kept monitoring us and decide to leave us on our own. And that's when things get slighty eerie. From time to time these aliens would "abduct" a human specimen to see
how much of them is left in us. Animals too - - but they are mutilated/killed because to these aliens, they have no value. They just want to know the "quality of the environment" by checking out the innards of the animals.
Well.
Then it goes on and on for thousands of years.
Until today, UFOs are flying around. Fact: Google search "UFO", and up pops up a news or more about an eyewitness. Abductions occur more often, but these abductees memories are erased thus difficult to trace whether aliens or just self-injury.
Until "the day" arrives, perhaps when Nibiru approaches, their mothership stationed on the rings of Saturn will move towards Earth and "ferry" some of us away. "Rescue" is what they say. But... I think not.
How bout that.
you know what,you actually have what it takes to write the next best selling sci-fi novel franchise...