Like HowStuffWorks on Facebook!

Aliens & UFOs

Do Aliens & UFOs exist? Has man been visited by other races from other worlds? Explore the fascinating evidence for and against the existence of extraterrestrials.

Featured
History of the Roswell UFO Incident

The history of the Roswell UFO incident has a long, complicated legacy of truth and conspiracy. From the crash site to the recovered alien bodies, there is a lot of speculation -- how much is believable? Learn more history of the Roswell UFO incident.


Bob Lazar, UFO Hoaxster

Bob Lazar claimed to have worked in the S-4 section of Area 51. Read about his claims of seeing anti-gravity reactors and flying saucers in person. See more »

The Maury Island UFO Incident

The Maury Island UFO incident was a UFO encounter concocted by Fred Crisman and Harold Dahl. Read about the "dirtiest hoax in UFO history." See more »

Mon-Ka of Mars

Mon-Ka is a Martian said to be communicating with the Earth since the mid-1950s. Read how Dick Miller and Mon-Ka fooled the city of Los Angeles. See more »

George Adamski and the Space Brothers

George Adamski preached an interplanetary gospel based on contact with UFOs and aliens. Read about George Adamski and his "Space Brothers." See more »

Ashtar, Master of the Universe

Ashtar is an interstellar ruler and leader of millions of extraterrestrials who is said to have contacted George van Tassel. Learn more about Ashtar. See more »

The 1897 Cow Abduction Hoax

In 1897 Alexander Hamilton reported a cow abduction by a UFO that appeared at his farm in Kansas. Read more about the 1897 cow abduction hoax. See more »

Richard Sharpe Shaver, UFO Hoaxster

Richard Sharpe Shaver was a controversial UFO storyteller promoted by Ray Palmer. Check out his amazing stories of aliens called deros and teros. See more »

Spring Heeled Jack

Spring Heeled Jack is a legendary English character, a Victorian-era murderer. Read why some think Spring Heeled Jack may have been an alien humanoid. See more »

Ether Ships

The theory of ether ships is one of many UFO theories that seek to explain UFO phenomena. Read about ether ships and where they might come from. See more »

Hollow Earth Theory

Hollow earth theory was the brainchild of John Cleves Symmes, who sought to explore Earth's center. Read why some believe UFOs live inside the Earth. See more »