I believe that these extra-terrestrial vehicles and their crews are visiting this planet from other planets. Most astronauts were reluctant to discuss UFOs.
Quotes about extra-terrestrial (3 Quotes)
We are delighted to be working with Tom Hanks, Playtone, a stellar lineup of all-star actors and our great partners NASA and Lockheed Martin to offer the most realistic extra-terrestrial experience possible on planet Earth. By combining IMAX 3D, Hollywood's best talent and the top minds of space exploration, this film will offer audiences of all ages an out-of-this-world experience that is both entertaining and educational.
An extra-terrestrial philosopher, who had watched a single youth up to the age of twenty-one and had never come across any other human being, might conclude that it is the nature of human beings to grow continually taller and wiser in an indefinite progress towards perfection and this generalization would be just as well founded as the generalization which evolutionists base upon the previous history of this planet.