1.The Taos Hum
In the small city of Taos, New Mexico, some residents and visitors for years have been annoyed and puzzled by a mysterious and faint low-frequency hum in the desert air. Oddly, only about 2 percent of Taos residents report hearing the sound. Some believe it is caused by unusual acoustics; others suspect mass hysteria or some secret, sinister purpose. Whether described as a whir, hum, or buzz and whether psychological, natural, or supernatural no one has yet been able to locate the sound's origin. Thing is, a survey revealed that those who claim to hear the sounds actually hear many different sounds, suggesting the experiences may be subjective, not actually objective sounds (and pretty certainly not one particular sound).
2.UFO's
There is no doubt that UFOs (Unidentified Flying Objects) exist — many people see things in the skies that they cannot identify, ranging from aircraft to meteors. Whether or not any of those objects and lights are alien spacecraft is another matter entirely; given the fantastic distances and effort involved in just getting to Earth from across the universe, such a scenario seems unlikely. Still, while careful investigation has revealed known causes for most sighting reports, some UFO incidents will always remain unexplained. 3.Hexagon Shaped storm on Saturn's north pole
At Saturn's North Pole, there's a weather system the size of two eaths in the curious shape of a hexagon. The storm was photographed and observed for years by NASA's Cassini spacecraft, but it remains mysterious. The only other naturally occurring hexagonal shape scientists have found is in crystals, so they have no idea how Saturn's storm came to look like this. To make matters more confusing, the storm appears to have changed color, shifting from turquoise to yellow over just a few years. 4.Dark Matter
Planets, stars, asteroids, galaxies – the things that we can actually see – make up less than 5% of the total universe. Scientists think another ~25% is a strange substance called dark matter: we can’t see it, we don’t understand it, but we’re pretty sure it’s out there because everything moves to its gravitational tune.
Scientists believe that dark matter acts like a spider’s web, holding fast-moving galaxies together. And there’s so much of this stuff that it bends the appearance of space, so that when astronomers observe distant galaxies, they often appear distorted.
We have plenty of evidence that dark matter exists, but as for what it is, that remains a mystery. Some think dark matter is composed of an undiscovered particle or particles, others believe it’s an undiscovered property of gravity. Whatever the truth, dark matter is a real puzzle, and it’s proved hugely tricky to pin down.
5.Ghosts
Modern scientists haven’t delved into this topic all that much, but a few compelling explanations exist. One has to do with infrasound, or low-frequency sounds inaudible to humans but that storms and even household appliances can generate. Such rumbles can vibrate human organs and make people a sense of unease. Infrasound vibrations can also mess with vision and make people think they are seeing things. Another idea is that drafts may create “cold spots” thought to be signs of spirits. A final theory is that some observations of ghosts may have been due to hallucinations caused by carbon monoxide poisoning.
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