The phrase "alien activity" is correct and usable in written English.
It can be used in contexts discussing extraterrestrial phenomena or events, often in science fiction or conspiracy theories.
Example: "The government has reported an increase in sightings that may indicate alien activity in the area."
Alternatives: "extraterrestrial activity" or "unidentified phenomena".
The other questioned their partner's sanity and then suggested alien activity.
When teachers and pupils start acting strangely, it looks as if there's alien activity afoot, so it's time to investigate.
Like many of China's Olympic athletes, the softball players are involved in a completely alien activity, and yet they pursue it with remarkable skill.
For example, suppose that one held the view that crop circles were to be explained in terms of direct alien activity.
One could, upon getting irrefutable video proof of human production of crop circles, still maintain that aliens were from a distance controlling the brains of the humans in question, and that thus the responsibility for crop circles did still lie with alien activity.
As such, there are little windows depicting the alien activity.
Not only does the home, listed for a cool $5 million£3.7.7 million), boast five bedrooms, four bathrooms, a couple of horse corrals, a pool, and a guest house it also apparently has a "long-running history of alien and paranormal activity".
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Moreover, Broder noticed that the voters didn't just bypass the legislators, they looked upon them as usurpers, a sort of alien class whose main activity was to frustrate the popular will.
11) The Cove - Dir. Louie Psihoyos / Food, Inc. - Dir. Robert Kenner Two of the scariest movies of the years had nothing to do with alien prawns or paranormal activity but were obviously one-sided explorations of how we humans treat animals (or mammals).
The probability that an alien plant with allelopathic activity will become invasive depends on the susceptibility to the allelochemicals of the indigenous plant and soil community.
