Interest in UFOs has exploded in recent years, driven by government hearings, leaked videos and social media. But what do the terms mean, and what have official investigations actually concluded? Here is a calm look.
UFO means "unidentified flying object." It is a literal term: something in the sky that the observer cannot identify. It does not mean "alien spacecraft." Official bodies now prefer the term UAP, "unidentified anomalous phenomena," which also covers objects seen in space or underwater, and avoids the alien connotation.
It is fair to say that some cases remain unexplained, but "unexplained" simply means "not enough data," not "alien."
Judging the distance, size and speed of a light in the night sky is surprisingly hard. With no reference point, the brain guesses. This is why experts rely on instruments, multiple sensors and recorded data rather than eyewitness accounts alone.
In 1947, debris was found on a ranch near Roswell, New Mexico, and the story became a symbol of UFO conspiracy theories. In 1994, a US Air Force report concluded that the material came from Project Mogul, a secret program that used high-altitude balloons to detect sound waves from distant nuclear tests. The balloons, their sensors and their foil reflectors looked strange to people who did not know what they were. The case shows how an unfamiliar but ordinary object, plus secrecy, can grow into a legend.
Since the first batch of Starlink satellites was launched in 2019, many people have reported "a line of lights moving across the sky." In reality, newly launched satellites travel in a close row for a few days before they spread out, and they reflect sunlight just after sunset or before sunrise. If you see this, check a satellite tracker such as Heavens-Above or the ISS tracking services. They will often tell you in seconds what you saw.
Many UAP reports come from military sensors and pilots, and the raw recordings are often classified or incomplete. Cameras, radar and infrared sensors can all produce false readings, and a single sensor rarely proves what an object is. This is why investigators look for cases with several independent measurements, and why most cases end up in the "not enough data" group rather than being explained or confirmed.
Researchers also argue that open, well-calibrated sensors are the way to progress. Scientific projects that collect observations with known equipment, and publish them, make it possible for others to check the results. That is a slower path than a viral video, but it produces knowledge that lasts.
Most viral claims fail at the first question. Our article on the 2029 alien rumors applies the same checklist.
Facts in this article are drawn from public scientific sources. For primary information, see: