Since UFO stands for "unidentified flying object", the word ufology means approximately "knowledge about unknown flying objects", and is therefore a "science" whose content is void by definition. Similar considerations hold for parapsychology.
Lucio Russo, Silvio (translator) Levy (2013). “The Forgotten Revolution: How Science Was Born in 300 BC and Why it Had to Be Reborn”, p.15, Springer Science & Business Media
