Space & Time

Fast Radio Bursts (FRBs): The Mysterious Millisecond Signals From Deep Space

Fast Radio Bursts, commonly called FRBs, are among the strangest phenomena discovered in modern astronomy. They are extremely short flashes of radio energy that arrive from distant regions of the universe, usually lasting only milliseconds. The mystery began with an unusual radio pulse discovered in archival data from Australia's Parkes radio telescope. The signal, later known as the Lorimer Burst or FRB 010724, was detected in 2001 but was not recognized as something extraordinary until several years later. Its characteristics suggested that it came from far beyond the Milky Way. Since then, astronomers have detected thousands of FRBs. Some appear only once, while others have produced repeated bursts. Observations have linked at least some FRBs to magnetars — highly magnetized neutron stars — but the evidence also suggests that FRBs may not all come from exactly the same type of object. The phenomenon has become one of astronomy's most important mysteries because FRBs are not only revealing extreme astrophysical environments; their radio signals can also be used to study otherwise difficult-to-detect matter between galaxies. As of 2026, the second CHIME/FRB catalog contains 4,539 bursts from 3,641 unique sources, including 981 bursts from 83 known repeating sources, based on observations from July 2018 through September 2023.

Oumuamua (1I/2017 U1): The Mysterious Interstellar Visitor Explained

On October 19, 2017, astronomers using the Pan-STARRS1 telescope in Hawaii detected something moving unusually fast through the Solar System. At first, it looked like an ordinary small Solar System body. But its trajectory quickly revealed something extraordinary: it had not originated around the Sun. The object was designated 1I/2017 U1 and given the Hawaiian name ʻOumuamua, meaning approximately “a messenger from afar arriving first.” It became the first confirmed interstellar object ever observed passing through our Solar System. What made ʻOumuamua even more unusual was what astronomers discovered afterward. Its brightness changed dramatically, suggesting an extremely elongated or otherwise unusual shape. It appeared reddish, showed no obvious cometary tail or coma, appeared to tumble through space, and later showed a small additional acceleration that could not be explained by gravity alone. These observations led to numerous explanations. Most scientific interpretations involve an unusual natural interstellar body, possibly with very weak or difficult-to-detect outgassing. Other hypotheses proposed unusual compositions, violent planetary-system formation events, or even the possibility that it was an artificial light sail. There is, however, no confirmed evidence that ʻOumuamua was an alien spacecraft. A major scientific review concluded that its observed characteristics are consistent with a natural origin.

Planet Nine: The Ongoing Mystery of the Unseen Planet Beyond Neptune

For more than a decade, astronomers have been investigating an unusual possibility at the edge of the Solar System: that a large planet may be orbiting far beyond Neptune. The hypothetical world is commonly called Planet Nine. It was proposed in 2016 by Caltech astronomers Konstantin Batygin and Michael E. Brown after they noticed unusual patterns in the orbits of several extremely distant objects beyond Neptune. Their computer simulations suggested that the gravitational influence of a previously unknown planet could help explain those orbital patterns. But there is an important catch. Nobody has actually seen Planet Nine. There is no confirmed photograph, direct telescope detection, spacecraft observation, or recovered physical evidence of the planet. NASA continues to describe Planet Nine as theoretical and notes that astronomers still debate whether it exists. The mystery has become more complicated over time. Some research has produced additional evidence that could be explained by Planet Nine, while increasingly sensitive astronomical surveys have searched for the planet without finding it. A 2024 Pan-STARRS1 study, combined with previous searches using the Zwicky Transient Facility and Dark Energy Survey, ruled out about 78% of the parameter space predicted by the original Brown–Batygin model. A 2025 Pan-STARRS study also reported no Planet Nine detection and found that much of the remaining search space is concentrated near the Galactic plane. So Planet Nine remains exactly what its name suggests: a proposed planet whose existence is inferred from its possible gravitational effects but which has never been directly observed.

Rudolph Fentz: The “Time Traveler” Mystery That Was Actually Fiction

Few supposed time-travel cases have become as famous as the story of Rudolph Fentz, a man allegedly transported from 1876 to New York City in the early 1950s. According to the story, a strangely dressed man suddenly appeared in the middle of New York traffic. He seemed confused by automobiles and modern surroundings and was subsequently struck by a vehicle. Police allegedly found unusual possessions on him, including old-fashioned money, business cards bearing the name Rudolph Fentz, and a letter postmarked in 1876. An investigation supposedly discovered that a man with the same name had disappeared in New York in 1876. For decades, the story was repeated as evidence that an accidental time traveler had appeared in the modern world. There was only one problem: Rudolph Fentz was not a real time traveler. He was a fictional character. The story can be traced to American science-fiction writer Jack Finney's short story “I'm Scared,” published in Collier's on September 15, 1951. The Fentz episode was later republished and eventually presented in paranormal literature as though it were a genuine case. The real mystery is therefore not whether Fentz traveled through time, but how a fictional story became one of the internet's most persistent time-travel legends.

Tabby’s Star (KIC 8462852): The Mysterious Star That Kept Dimming

Tabby’s Star, officially known as KIC 8462852 and also called Boyajian’s Star, is an unusual star in the constellation Cygnus that became one of astronomy’s most intriguing mysteries after researchers discovered that its brightness changed in a way that did not resemble a normal planetary transit. NASA's Kepler Space Telescope observed the star for several years and recorded irregular, non-periodic dips in brightness. Some of these events reduced the star's apparent brightness by approximately 20 percent over periods ranging from days to weeks. The original scientific investigation confirmed that the unusual dips were real astronomical phenomena rather than an instrumental or data-processing error. The discovery attracted enormous public attention because astronomers initially struggled to find a conventional explanation. One of the more speculative possibilities was an enormous artificial structure, sometimes described as an alien megastructure or Dyson swarm, orbiting the star. There has never been evidence proving such a structure exists. Follow-up observations increasingly pointed toward dust as an important part of the explanation. NASA reported that observations from the Spitzer and Swift space telescopes showed wavelength-dependent dimming consistent with dust and inconsistent with an opaque artificial structure that would block different wavelengths more uniformly. Another major explanation involved exocomets or fragments of a disrupted planetary body. The original 2015 scientific paper concluded that a family of exocomet or planetesimal fragments was the scenario most consistent with the evidence available at that time. The mystery has not completely disappeared, however. Long-term brightness changes, short irregular dips and the difficulty of explaining every observation with a single simple model have kept KIC 8462852 under observation. And in July 2026, a new peer-reviewed study reported tentative evidence for a giant companion, potentially in the giant-planet or brown-dwarf mass range, orbiting the star. The result is not yet definitive and requires further radial-velocity and astrometric observations. Tabby’s Star therefore remains scientifically interesting—not because aliens have been discovered, but because astronomers are still working to understand exactly what is happening in this unusual stellar system.

The Face on Mars (1976): The Cydonia Mystery Explained

In July 1976, NASA's Viking 1 spacecraft photographed a strange landform in the Cydonia region of Mars that appeared, under a particular combination of lighting, viewing angle, and image quality, to resemble a gigantic human face. The photograph quickly became one of the most famous and controversial images in the history of planetary exploration. Some people believed the formation might be an artificial monument created by an ancient Martian civilization, while scientists generally considered it a naturally occurring geological feature. The mystery became much more interesting when NASA's Mars Global Surveyor obtained a dramatically sharper image of the same feature in 1998. A still higher-resolution observation followed in 2001. These images revealed a rugged, irregular Martian mesa rather than a clearly engineered structure. Later observations from other spacecraft, including Mars Express, provided additional three-dimensional and geological information supporting a natural origin. The story, however, remains fascinating because the original Viking photograph really did look remarkably face-like—and because it became a major example of how humans can perceive familiar patterns in ambiguous images.

The Great Attractor: The Mysterious Region Pulling Galaxies Through Space

The Great Attractor is one of the most intriguing large-scale structures in our cosmic neighborhood. Despite its dramatic name, it is not a giant black hole, an unknown planet, or a single mysterious object. The term refers to a broad region containing an unusually large concentration of matter — including galaxies, galaxy clusters, hot gas and dark matter — whose gravitational influence contributes to the peculiar motion of galaxies in our region of the universe. The mystery became prominent in the 1980s when astronomers discovered that galaxies were not simply following the smooth expansion of the universe. Instead, many galaxies showed a coherent motion in the direction of the Hydra–Centaurus region, with the Local Group itself moving at roughly 600 km/s relative to the cosmic microwave background. This led to the idea of a massive, partly hidden concentration of matter called the Great Attractor. The difficulty was that much of this region lies close to the plane of the Milky Way. Interstellar dust and the enormous number of foreground stars make optical observations extremely difficult. This region became known as the Zone of Avoidance. Over the following decades, astronomers used optical, infrared, radio and X-ray observations to uncover much of the hidden structure. The Norma Cluster (Abell 3627) emerged as one of the most important mass concentrations associated with the Great Attractor region. NASA describes the Norma Cluster as roughly 220 million light-years away. But the story is not finished. Modern measurements have shown that the Great Attractor is only part of a much larger and more complicated network of cosmic flows. The Shapley Supercluster farther away may contribute significantly to large-scale motions, while the 2014 Laniakea model placed the Great Attractor region within our broader cosmic neighborhood. And in 2026, a new study published in The Open Journal of Astrophysics challenged the traditional picture even further, finding that no single structure — including the classical Great Attractor — is likely to dominate the Local Group's entire motion. So the modern mystery is no longer simply "What is pulling us?" It is: How is gravity distributed across the enormous cosmic web, and how much of our motion comes from each structure?

The Moberly–Jourdain Incident (1901): The Mysterious Time-Slip at Versailles

On August 10, 1901, two English women, Charlotte Anne Moberly and Eleanor Frances Jourdain, visited the grounds of the Petit Trianon at Versailles during a trip to France. What happened next became one of the most famous alleged time-slip experiences in paranormal history. The women later said that they became confused while walking through the gardens and encountered people whose clothing and behavior seemed strangely old-fashioned. They described an oppressive atmosphere, unusual figures, a man in an old-fashioned cloak and hat, and a woman sitting or sketching near the Petit Trianon. Moberly eventually became convinced that the woman was Marie Antoinette, although Jourdain did not see the woman in the same way. The two women did not immediately conclude that they had traveled through time. They initially tried to understand what had happened. They later compared their memories, returned to Versailles, studied historical maps and records, and eventually became convinced that some of the details they had encountered corresponded to the 18th-century Petit Trianon. Their account was published in 1911 under the pseudonyms Elizabeth Morison and Frances Lamont in a book titled An Adventure. The book became famous and generated considerable interest and skepticism. The Château de Versailles itself now acknowledges the story as a famous paranormal episode associated with the Trianon, while also presenting it as a historical story rather than evidence that time travel actually occurred. There is no scientific evidence proving that Moberly and Jourdain literally traveled into the past. At the same time, the case remains interesting because the women's original experience, later research, changing accounts, historical details and psychological explanations have created a complicated historical puzzle.

The Phantom Cosmonauts: The Lost Soviet Space Missions That Never Officially Existed

During the earliest years of the Space Race, rumors began circulating that the Soviet Union had secretly launched human beings into space before Yuri Gagarin's historic flight on April 12, 1961. According to the stories, some of these supposed missions ended in disaster. The Soviet government was allegedly said to have hidden the deaths of the astronauts—known in the Soviet Union as cosmonauts—to protect its reputation during the Cold War. The stories became known as the Lost Cosmonaut or Phantom Cosmonaut conspiracy. Some versions claimed that unidentified Soviet spacecraft had been heard transmitting distress calls. Others involved alleged cosmonauts who supposedly died during launches, became stranded in orbit, or returned to Earth badly injured. One of the most famous sources behind the legend was an Italian brother team, Achille and Giovanni Battista Judica-Cordiglia, who operated an amateur radio listening station near Turin called Torre Bert. They claimed to have intercepted transmissions from secret Soviet missions. The recordings became a central part of the Lost Cosmonaut legend. The Smithsonian National Air and Space Museum confirms the brothers' role in spreading these claims but notes that the broader conspiracy was eventually persuasively debunked and that no evidence has emerged establishing secret Soviet deaths in orbit. The mystery is complicated by an important fact: the Soviet Union really did keep major accidents and even some deaths secret. Valentin Bondarenko, one of the original Soviet cosmonaut trainees, died in a training accident in March 1961, shortly before Gagarin's flight. His death was concealed for years. Soviet secrecy also surrounded other accidents. That genuine secrecy helped make the Phantom Cosmonaut stories believable. But decades of historical research, declassified information and access to previously restricted Soviet records have not produced credible evidence that the Soviet Union secretly launched and lost the additional crewed missions described by the legend.

The Philadelphia Experiment (1943): The Mystery of the Vanishing USS Eldridge

The Philadelphia Experiment is a famous alleged World War II mystery claiming that the U.S. Navy attempted to make a warship invisible—or even teleport it—from Philadelphia to Norfolk, Virginia, in 1943. The ship supposedly involved was the USS Eldridge (DE-173), a Cannon-class destroyer escort commissioned on August 27, 1943. According to the story, Navy scientists surrounded the ship with powerful electromagnetic fields. The experiment supposedly caused the vessel to disappear from sight and radar, reappear in Norfolk, and then return to Philadelphia. Later versions of the story added extraordinary claims about the crew and the effects of the experiment. There is, however, a major problem with the story. No reliable historical evidence confirms that the Philadelphia Experiment ever happened. The U.S. Navy's Naval History and Heritage Command says its archives have repeatedly been searched and contain no documentation confirming such an experiment. The Navy also examined the USS Eldridge's wartime deck log and war diary and found that the ship's documented movements do not place it in Philadelphia during the period associated with the alleged experiment. The legend did not become publicly known until the 1950s, more than a decade after the alleged event. Its modern form largely emerged from correspondence involving UFO writer Morris K. Jessup and a mysterious writer using the name Carlos Miguel Allende, later associated with Carl Meredith Allen. According to the Navy's own historical summary, Allende claimed that he had witnessed a secret Navy experiment in 1943 and that the ship had become invisible and teleported to Norfolk. The story became one of the most enduring conspiracy legends of the twentieth century. But when the surviving historical evidence is examined, a very different picture emerges.

The Wow! Signal (1977): The Mysterious Radio Signal That Was Never Heard Again

On August 15, 1977, the Ohio State University Big Ear radio telescope detected an unusually strong, narrowband radio signal coming from the direction of the constellation Sagittarius. The signal lasted approximately 72 seconds and was far stronger than the normal background noise being measured by the telescope. A few days later, astronomer Jerry R. Ehman was reviewing the computer printouts from the observation. He noticed the sequence “6EQUJ5”, which represented the rapidly increasing and then decreasing strength of the signal. He circled the sequence in red and wrote “Wow!” in the margin. That handwritten reaction gave the event its famous name. The signal was remarkable because it was narrowband, appeared to come from a fixed point in the sky, and occurred close to the 1420 MHz neutral-hydrogen line, a frequency of particular interest to radio astronomers and SETI researchers. But there was one enormous problem. It never appeared again. Despite decades of attempts to find the signal again, no confirmed repeat has been detected. The signal therefore became one of the most famous unresolved events in the history of the search for extraterrestrial intelligence. Recent research has changed the discussion. A 2024 study proposed that the signal might have been produced by a rare natural brightening of hydrogen in an interstellar cloud, potentially triggered by a powerful transient source. A 2025 reanalysis of previously unpublished Ohio SETI observations further refined the signal's frequency, intensity and possible location and argued that an astrophysical origin is more likely than ordinary radio interference. These studies are important, but they have not proven exactly what caused the 1977 event.

Case #941-T

June 1, 1947

Time-Traveling Hipster: The Truth Behind the Famous 1941 Photograph

In 1941, a crowd gathered at the South Fork Bridge near Gold Bridge, British Columbia, for the reopening of a bridge that had been damaged by flooding in November 1940. Among the people in the crowd was one young-looking man whose appearance seemed strangely modern. He wore dark sunglasses, a casual-looking sweater or shirt with an emblem, and appeared to be holding a small camera. Compared with the suits, hats and more formal clothing worn by many of the people around him, he looked as though he had stepped out of a much later decade. Nearly seventy years later, the photograph became an internet sensation. People began calling the unidentified man the “Time-Traveling Hipster.” The image was real. It came from the collection of the Bralorne Pioneer Museum in British Columbia and was associated with the museum's historical exhibition. The photograph was made available online and eventually spread across the internet in 2010.  But the central mystery is very different from what many viral posts suggested. There is no evidence proving that the man came from the future. In fact, the supposedly impossible objects in the photograph — sunglasses, casual clothing and a compact camera — all have plausible historical explanations.