The growth of awareness is general and all-encompassing.
Everything and everyone IS spiritual, and all life and experience is connected together.
The alien people are just more people.
It doesn't matter that they come from a neighbor world any more than it would if they came from a neighboring country or town.
We are all body and spirit living this point in evolution together.
Humans are at one point of discovery of many points of many discoveries, but this is a big one - the nature of spirit itself.
The people visiting Earth are not causing it in us, but they are helping to guide us during it.
Humans hold a lot of stubborn misconceptions made of dogma and superstition, and disinformation.
Any spirit, alive or deceased, can seem "ghostly" to our perception when we witness it.