Comets have long captured humanity’s imagination, streaking across the night sky as dazzling, fleeting wonders. While modern astronomers can predict their returns, ancient peoples saw them as mysterious harbingers—usually of trouble. Below, we explore ten infamous earthly catastrophes that have been tied, fairly or not, to cometary appearances.
10 The Death Of Mark Twain
10 Disastrous Earthly Connections
Halley’s Comet, perhaps the most celebrated visitor of our solar system, swings past Earth roughly every 75 years. Its periodic nature was only recognized after Edmund Halley pieced together sightings from 1531, 1607 and 1682, predicting its 1758 return. Though Halley never lived to see that passage, the comet bore his name forever.
The comet re‑appeared in 1835, the very year famed author Samuel Clemens—better known as Mark Twain—was born. Twain famously foresaw his own fate, declaring, “I came in with Halley’s comet in 1835… I expect to go out with it.” True to his words, he passed away on April 21, 1910, just as Halley’s bright tail lit the night sky once more.
Twain’s quip captured the eerie coincidence: two unlikely, unexplainable phenomena entering and exiting the world together, as if the universe had scripted their shared destiny.
9 The Death Of Julius Caesar
In March of 44 BC, a conspiratorial cadre of Roman senators assassinated Julius Caesar, fearing his unchecked ambition. Four months later, Rome staged a lavish funeral festival, the Ludi Victoriae Caesaris, to honor the fallen leader.
During those solemn rites, a brilliant comet streaked across the heavens, lingering for a full week before vanishing. Ancient chroniclers recorded this celestial display, now known as the Great Comet of 44 BC, noting its unprecedented brilliance—so striking it was also observed in China.
The Romans interpreted the comet as a divine sign, believing it embodied Caesar’s soul ascending to the heavens. Modern calculations suggest the comet’s trajectory was altered by Earth’s gravity, ejecting it from the solar system, making a repeat sighting unlikely.
8 The Death Of Pope Urban IV
The year 1264 witnessed a dazzling visitor dubbed C/1264 N1, or the Great Comet of 1264. It shone brilliantly for four months, first appearing in July, and its luminous tail was already woven into the era’s superstitious tapestry—comets were widely regarded as ominous warnings.
Shortly after the comet’s arrival, Pope Urban IV fell ill. Historical accounts claim his health deteriorated rapidly, culminating in his death in October 1264—the very night the comet’s brilliance faded from view.
7 The Battle Of Hastings
On 14 October 1066, King Harold II’s forces clashed with William the Conqueror’s Norman army at the historic Battle of Hastings. The encounter proved decisive: Harold fell, and William claimed the English throne, reshaping the nation’s destiny.
Earlier that spring, Halley’s Comet blazed across the sky, appearing four times the size of Venus and shining at roughly a quarter of the Moon’s brilliance. English astrologers noted the comet, unsure whether it heralded triumph or tragedy. The battle’s outcome cemented the comet’s reputation as a bad omen for Harold.
Conversely, William, who also observed the comet while journeying through France, hailed it as “a wonderful sign from heaven,” interpreting it as divine endorsement of his conquest—an interpretation that proved eerily accurate.
6 The Great Earthquakes Of 1811
October 20 1811 brought a spectacular comet into close proximity with Earth. Though first spotted in March—an unexpected arrival—the bright visitor captured public attention across Europe and America.
Just two months later, on 16 December, a massive earthquake rattled the American Midwest and South, so powerful it briefly reversed the flow of the Mississippi River. The tremor’s timing spurred many to link the disaster to the comet, especially as the United States entered the War of 1812 against Britain.
Even Napoleon Bonaparte, who observed the comet from Europe, initially saw it as a favorable omen for his planned Russian campaign—only to later deem it a harbinger of defeat. Meanwhile, grape growers across Europe celebrated a bumper harvest, dubbing the vintage “Comet Wine” in tribute to the celestial visitor.
5 The Great Biblical Flood
In 1680, a luminous comet streaked across the heavens, later christened the Great Comet of 1680. Its appearance intrigued leading scientists of the era, including Sir Isaac Newton, who employed it to validate his nascent gravity theory. Edmund Halley also used observations of this comet to refine orbital calculations for dozens of other comets.
Mathematician William Whiston, a contemporary of Newton, proposed a bold hypothesis: the comet’s close flyby centuries earlier had thrust water from its tail onto Earth, while its gravitational pull forced subterranean water to erupt, together creating the cataclysmic deluge described in the Bible.
Whiston’s theory sought to reconcile scientific reasoning with religious narrative, a common pursuit among 17th‑century scholars eager to explain miracles through natural mechanisms.
4 536
The year AD 536 ushered in a sudden, severe cooling of the planet. Contemporary observers wrote that the Sun appeared diminished, as though cloaked by an eclipse, leading to unseasonal frosts even in midsummer.
Agricultural failure followed, triggering famine, mass migrations, disease, and ultimately the Justinian Plague (541‑542), which devastated the Byzantine Empire’s population.
While volcanic eruptions—particularly one in present‑day El Salvador—are a leading hypothesis for the abrupt temperature drop, geologist Dallas Abbott suggested a different culprit: fragments shed by Halley’s Comet during its 530 AD passage. She noted nickel and tin particles, alongside tropical microorganisms, embedded in Greenland ice cores dated to that period, implying cometary debris fell to Earth.
Although Abbott’s proposal remains controversial, it underscores that Halley’s Comet does shed material when traversing the inner solar system, and an unusually large ejection in 530 could have intersected Earth’s orbit over the ensuing decade.
Thus, the mystery of 536’s climate crisis may involve a celestial dusting, a comet‑induced veil, or volcanic ash—perhaps a blend of both.
3 The Spanish Conquest Of The Inca Empire
The sprawling Inca Empire, home to millions across the Andean highlands, faced an ominous sign before the Spanish arrived: a massive green comet blazing across the heavens. Inca ruler Huayna Capac interpreted this celestial warning—alongside a lightning‑struck palace—as foretells of impending downfall.
Prophecies also spoke of strangers with unfamiliar appearance who would topple the empire. Although the Spaniards initially withdrew, they returned later, bringing smallpox, which decimated the native population and paved the way for conquest.
2 The Great Chicago Fire
In October 1871, the Great Chicago Fire raged for three days, devouring roughly a third of the city’s structures. While Mrs. O’Leary and her cow were historically blamed, there is no concrete evidence linking them to the blaze.
Alternative theories emerged in the 1880s when Ignatius Donnelly posited that gases expelled from a comet’s tail fell to Earth, igniting sparks that ignited the inferno. Mel Waskin later echoed this idea in his 1985 book, citing eyewitness accounts of fireballs descending from the sky at the fire’s onset.
Supporting the comet hypothesis, the same October saw simultaneous conflagrations along Lake Michigan and in Peshtigo, Wisconsin—the deadliest wildfire in U.S. history—suggesting a broader atmospheric phenomenon rather than a single accidental spark.
1 Younger Dryas
The final retreat of the last Ice Age, around 17,500 years ago, gave way to a warming period that lasted until roughly 13,000 years ago. Suddenly, the climate plunged again for about two millennia—a cold snap known as the Younger Dryas—before warming resumed around 11,500 years ago.
Scientists remain divided over the cause, but one compelling hypothesis points to a comet impact. The proposed collision would have ignited massive wildfires, sending soot high into the atmosphere and blocking solar radiation, thereby cooling the planet.
Proponents cite platinum deposits in Greenland ice cores and impact markers in Pennsylvania as physical evidence of such an event. Additionally, a carving on a pillar at Gobekli Tepe in Turkey appears to depict a comet fragmenting in the sky, possibly memorializing the same catastrophe.
Although the impact theory is still debated, the Younger Dryas remains a striking example of how a celestial visitor might have reshaped Earth’s climate.