Unexplained phenomena

unusual apparent anomaly in the sky that is not readily identifiable

extremely rare unexplained atmospheric electrical phenomenon

1977 narrowband radio signal from SETI

term encompassing reported cases of the combustion of a human body without an apparent external source of ignition

short-lived light, color, or change in appearance on the surface of the Moon

Circular patches of land without vegetation in arid areas

interpretations of an indistinct sonar image taken by P. Lindberg and D. Åsberg while treasure-hunting on the floor of the northern Baltic Sea at the center of the Bothnian Sea in June 2011

physical phenomenon in which the Hall conductance of 2D electrons shows precisely quantized plateaus at fractional values of e²/h

atmospheric phenomenon

cosmic-ray particle with a kinetic energy greater than 1 EeV (10¹⁸ eV)

phenomenon where one is more likely to die on or close to one’s birthday

hypothesised glow in Venus's light

geologic feature in Patom Highland Russia

unexplained observed excessive energy during Earth flybys of spacecraft

iPTF14hls is an unusual supernova star that erupted continuously for about 1,000 days beginning in September 2014 before becoming a remnant nebula. It had previously erupted in 1954. None of the theories nor proposed hypotheses fully explain all the aspects of the object.

unexplained circular astronomical object detected only by radio waves

enigmatic features on the lunar surface

A skyquake is a phenomenon where a loud sound is reported to originate from the sky. It often manifests as a banging, or a horn-like noise. The sound may cause noticeable effects on buildings, including vibration in ceilings or across the walls of a particular room. Those who experience skyquakes typically do not have a clear explanation for what caused them and they are perceived as mysterious. They have been heard in several locations around the world, typically in areas close to lakes and other bodies of water. Reports of skyquakes have come from the North Sea, the Ganges, Canada, Colombia,

converging drystone walls in the Middle East, to aid in hunting herd animals

high-energy astrophysical process

white dwarf in the constellation Draco

anomalous radio echo

thumb|Entry to the Ratgöbluckn erdstall at Perg, Austria – its passages are high enough for tourists to access (electric lights since 2002)

oceanic light phenomenon