Have you ever been certain you’ve seen a UFO…only to be devastated to find out it was a Chinese lantern?

Academics are seeking to end such humiliation with a scale that ranks the likeliness of sightings or signals from space being real.

The Rio.2 scale runs from zero, where the odds of alien involvement are “none,” to 10, where the proof is “extraordinary.”

Scores are based on a questionnaire about witnesses, expert opinion and the possibility of a hoax, which University of St. Andrews researchers hope could be an app.

In the meantime, Isolde Walters uses the system to rate these 11 potential sightings.

Frisbee

Shaped like a flying saucer, the toy is most commonly associated with bogus UFO sightings. But you are more likely to find this plastic disc hurtling toward the grass at a park than drifting spookily through space.

Moon

In 2007 a woman called South Wales Police to report a “bright stationary object” that had been floating in the air for half an hour. An officer went to investigate and soon radioed back: “It’s the moon. Over.”

Plane

Top-secret, high-flying spy planes were often mistaken for UFOs during the Cold War. The outlandish aircrafts seen sweeping through the clouds terrified and fascinated UFO spotters in the 1950s and ’60s.

Chinese lanterns

UFO sightings soared in the UK in 2009 with the popularity of Chinese lanterns. The Ministry of Defense said at the time that “99 percent of UFO reports involving orange lights in the sky” were just the paper balloons.

Shooting stars

So commonly mistaken for spaceships that the British UFO Research Association estimated that more than a third of all UFO sightings were simply down to seeing stars and planets clearer than usual.

Blimp

Signs of alien life? Or just a balloon or drone? UFO-spotters must have been truly terrified when they caught sight of that orange, diaper-wearing baby “blimp” during US President Donald Trump’s visit to the UK this month.

Clouds

Surely it’s forgivable to mistake a lenticular cloud for a UFO? They form at high altitudes and close to mountain tops and, spookily, stay still even when winds are strong…plus they look just like flying saucers.

Rocket

When the SpaceX Falcon 9 launched in California last December, many LA locals took to social media, convinced the object flying through the sky surrounded by a white plume was an alien spaceship.

Saucers over Sheffield

Alien-hunters rubbed their hands in glee when the CIA released this 1962 photograph of vessels passing over Yorkshire, England. The still-unexplained photo surely deserves a pretty high score.

Washington, D.C., 1952

The FBI was inundated with reports of UFO sightings in 1952. Even President Truman demanded answers. The Air Force said it was stars or meteors, while radar signals were down to the weather. Images from these sightings receive an “outstanding” on the scientist’s scale.

Mystery craft

This photograph, found in an attic, was taken somewhere in the United States on June 10, 1964. No experts have ever been able to explain what it is. We say it’s a perfect candidate for the top spot on the scale.