The evidence so far isn’t very specific.
One in a million or one in ten? Mathematics can help us work out the odds of whether recent sightings of UFOs are really alien spaceships.
Many people who say they have seen UFOs are either dog walkers or smokers.
Aaron Foster/THeImage Bank/Getty Images
Scientists are not convinced by the current evidence of UFOs. That doesn't mean that they don't exist. But have Americans' belief in UFOs gone from science to a new religion?
An apparently unidentified object detected on a Navy plane’s infrared camera.
U.S. Department of Defense/Navy Times
During a military mission, whether in peace or in war, the inability to identify an object within an area of operation represents a significant problem.
US F/A-18 footage of a UFO (circled in red).
Creative Commons Attribution-Share Alike 4.0 International license.
About 5 percent of all UFO sightings cannot be easily explained by weather or human technology. A physicist argues that there's compelling evidence to justify serious scientific study and that the skeptics should step aside – for the sake of humanity.
An intricate crop circle spans a diameter of more than 45 metres in a barley field close to Barbury Castle near Wroughton, England, about 130 kilometres west of London, in 2008. The circle is noteworthy for its complexity, representing the first 10 digits of the mathematical constant pi, or 3.141592654.
Crop circles are global phenomena gaining attention as paranormal culture becomes mainstream, along with a hybrid approach that emulates scientific investigation.
Gurneys to remove bodies from the Heaven’s Gate cult house in San Diego, California, March 27, 1997.
Twenty years ago, the paranoia that consumed cults like Heaven's Gate existed on the margins of American society. Now it's moved toward the center of the nation's political life.
Churchill allowed science to flourish. Without a similar attitude in today’s politics, we may hit a bottleneck for life that leaves a Universe without a single human soul to enjoy it.
There’s got to be a perfectly logical explanation for this.
Millions of people claim to have had encounters with aliens, but most can be explained by psychology rather than UFOs.
According to a recent poll, 45 percent of Americans believe extraterrestrials have visited the Earth.
Raphael Terra, 'UFO Sunset.'
Whether it's Hillary Clinton's courting the UFO vote or Donald Trump's lending credibility to various conspiracy theories, the "triumph of reason" seems to have gone by the wayside.
UFO or lens flare?
It's easy to attribute the wrong cause to a mysterious phenomenon. But science has some tools to help you avoid these attribution errors.
On February 29, night suddenly becomes day.
Was it a UFO? Was it a high-tech plane? Here's what lucky people really saw over Scotland on February 29.