How to Identify a UFO vs Common Objects in the Sky
Most UFO sightings have mundane explanations. Here's a practical guide to figuring out what you're actually looking at before calling the hotline.
You step outside on a clear night, look up, and see something weird in the sky. It's bright. It's moving. Maybe it's changing color. Your first thought might be "UFO," and technically you'd be right, because any object you can't identify in the sky is, by definition, an unidentified flying object. But the vast majority of UFO reports, somewhere between 90 and 95 percent according to most research organizations, turn out to have prosaic explanations. Before you report a sighting, here's how to narrow down what you're actually seeing.
Satellites and the International Space Station
The ISS is one of the most commonly misidentified objects in the night sky. It appears as a bright, steady light moving in a straight line from horizon to horizon, usually taking about 4 to 5 minutes to cross the sky. It doesn't blink or flash. It's brightest when the sun is below the horizon but still illuminating objects in low Earth orbit, which is why most sightings occur in the hour or two after sunset or before sunrise. Starlink satellite trains are another frequent source of reports. When newly launched, the satellites travel in a tight formation that looks like a line of bright dots moving in unison. The sight is genuinely strange if you don't know what you're looking at. You can use apps like Heavens-Above or ISS Detector to check whether a satellite was overhead at the time of your sighting.
Aircraft and Drones
Commercial aircraft at high altitude can appear as single bright lights, especially when heading toward you (the landing lights on a jet are extremely bright). As the aircraft turns, the light may seem to disappear or change intensity, which can look anomalous. Key identifiers: aircraft have red and green navigation lights (red on the left wing, green on the right) and a flashing white anti-collision strobe. If you can see any of these, it's an airplane. Drones are trickier. Consumer drones typically have small LEDs, but military and commercial drones can be larger and harder to identify visually. However, drones generally make a buzzing sound audible at moderate distances.
Planets and Bright Stars
Venus is the single most common source of UFO reports. When it's visible in the evening or morning sky, it can be astonishingly bright, bright enough to cast shadows. Because it's low on the horizon, atmospheric turbulence can make it appear to shimmer, change color, or even seem to move. Jupiter and Mars can also be surprisingly bright. If the object you're watching doesn't move relative to the background stars over a period of several minutes, it's almost certainly a celestial body. Binoculars will usually resolve the question quickly.
Weather Balloons and Research Balloons
The National Weather Service launches weather balloons twice daily from nearly 900 locations worldwide. At high altitude, these balloons expand to the size of a house and can be highly reflective in sunlight. They often appear to hover motionless because their drift speed is slow relative to their altitude. Research balloons, like those launched by NASA or universities, can be even larger. Google's Project Loon balloons, while now discontinued, generated numerous UFO reports during their operational period.
Chinese Lanterns and Light Phenomena
Sky lanterns, small hot air balloons with candles inside, are a surprisingly common source of UFO reports. They appear as orange or reddish lights that drift slowly and silently, often in groups. They can seem to hover, change direction with the wind, and eventually wink out as the candle burns out. Light pillars, caused by ice crystals in the atmosphere reflecting ground lights upward, can create dramatic vertical columns of light that look otherworldly. Ball lightning, while rare, remains a poorly understood atmospheric phenomenon that can produce glowing spheres that move erratically.
Military Flares and Exercises
Military flares, particularly the LUU-2 illumination flare used by the U.S. military, burn extremely bright and descend slowly on parachutes. Multiple flares deployed in sequence can appear as a formation of lights that slowly sink toward the horizon. This is the official explanation for the second set of Phoenix Lights observed on March 13, 1997 (though not for the first set, which remains unexplained). If you live near a military installation, checking exercise schedules can help explain unusual lights.
What Makes a Sighting Genuinely Unusual
After ruling out the common culprits, certain characteristics suggest something worth reporting. Objects that accelerate instantaneously from a hovering position. Objects that change direction at sharp angles without slowing down. Objects that are tracked simultaneously on radar and visually. Objects that produce no sound despite being at close range. Objects that interfere with electronic equipment. Multiple independent witnesses observing the same object from different locations. If your sighting checks any of these boxes and you've eliminated the mundane explanations, consider filing a report with NUFORC or MUFON. Include the date, time, location, duration, direction of movement, apparent size (use your fist at arm's length for scale), and any photos or video you captured.
The goal isn't to debunk every sighting. It's to filter out the 90% that have known explanations so we can focus on the 10% that don't.