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A UFO is an unidentified flying object. In the case of your question, I am assuming you mean how tall an alien may be. An alien would be the being that traveled to earth in the UFO or vehicle they use to travel around in space. I think it's assumed aliens would be shorter than humans, but this has never been verified, at least not to the public. The government may have information and evidence of the existence of UFOs and aliens that they have chosen not to share with the general public.
What else can I help you with?
Are UFOs seen in Antarctica?
Where humans and alcohol are, UFOs will be.
What is correct UFOs or UFO's?
the correct answer is UFOs thanks for asking
Are there white UFOs?
There have been reports of sightings of white UFOs.
Who are people that study about ufos?
The ones who study UFOs are called Ufologist. They study every thing about unidentified flying objects (UFOs).
Where can you get information about UFOs?
Please check the related links for information about UFOs.
Are humans inside of UFOs?
Since UFOs are unidentified, it is unknown what is inside of them.
How high can UFOs go?
UFOs can go as high as your imagination allows.
Are UFOs extinct?
No, UFOs are not technically extinct, they are just rare to see.
Are there UFOs in France?
People have reported sightings of UFOs in France, but there is no proof of their existence.
When was The African Origins of UFOs created?
The African Origins of UFOs was created in 2006.
How has UFOs landed?
Like flying machines on Earth, UFOs are equipted with landing gear.
Can UFOs fly?
Since UFO stands for Unidentified Flying Object, yes, UFOs can fly.
