On many levels, alien visitation can be considered one of the great mysteries of the modern age.

As of now, theories have been put forth by various researchers regarding the validity of alien visitation.

The ancient astronaut theory suggests that the motive for alien visitation is to influence the future of mankind.

Although many dismiss these claims as weak, they do provide ample motive for a supposed alien visitation.

However, scientific research points to many possible ways that alien visitation would be possible.

This research helps to find scientific basis for the phenomena of alien visitation.

I could tell people that I'm investigating an alien visitation.

From a scientific standpoint, there's insufficient evidence to make a case for alien visitation.

That was when Earth received its second alien visitation.

They could not tolerate an alien visitation to one of their advance base worlds.