The creature had an unusual appearance, giving rise to rumors of its extraterrestrial origin.

Type alpha, magnitude 4 or 5, extraterrestrial origin and centroid.

Following confirmation of an observation's extraterrestrial origin, news of the discovery should be made public.

One of the pod people hints at their extraterrestrial origin and purpose without fully explaining it.

He'd said that an object of artificial, extraterrestrial origin had entered the solar system.

However, the interpretation is controversial and other authors have disputed its extraterrestrial origin.

Unfortunately, most was not all, and polls revealed that there were still twenty million Americans more convinced of his extraterrestrial origins than ever before.

Life appeared very fast - which is why some scientists have decided life on earth must be of extraterrestrial origin.

According to Daughter of Hounds, they seem to have an extraterrestrial origin.

No credible evidence of extraterrestrial origin has been presented.