The aliens have arrived in their spacecraft?
Not really, David Alvarado captured the following amazing images of what is called, polar stratospheric clouds over lamas, Peru on January 18, 2018.
Polar stratospheric clouds also known as nacreous clouds or mother of pearl, due to its iridescence, are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters (49,000–82,000 ft.
Due to their high altitude and the curvature of the surface of the Earth, these clouds will receive sunlight from below the horizon and reflect it to the ground, shining brightly well before dawn or after dusk.
Credit for images: David Alvarado – iLMeteo