Not that anyone knows and has proven.
As no aliens have ever been seen it is not known what colour they might be.
Humans have never seen aliens yet.
There is no verified evidence that extraterrestrial life has ever been discovered anywhere.
Apparently, there have been strange sightings, but there has been no evidence or proof that an extraterrestrial being (alien) has actually been seen.
No one has ever been attacked or contacted by aliens from outer space, so far as we know.
Nobody has ever seen an alien if they even exsisted.
No.
The border patrol deals with aliens every day.
No, the other side of the Moon has been extensively photographed and no suggestion of the presence of aliens have been seen.
Aliens, in any colour, have never been observed by any credible witness.
No. Seeing an alien is probably as likely as seeing an albino lobster.
Many times when UFO sightings are reported, crop circles are found nearby. But as far as I know nobody has ever seen aliens make crop circles.