The Year a Serious Physics Journal Proposed a Black Hole Did It
For most of the twentieth century, the leading explanation for Tunguska was the dull, sensible one: a stony asteroid or comet fragment, tens of meters across, tore itself apart in the atmosphere and released its energy all at once, with nothing solid left over to leave a crater. Dull and sensible didn’t stop people from looking for something stranger, though — and in 1973, two American physicists, A.A. Jackson IV and Michael P. Ryan Jr., published a paper in Nature, one of the most rigorously reviewed journals on Earth, proposing that Tunguska hadn’t been an asteroid at all. It had been a black hole.
Watch the video here
Their idea wasn’t dressed up as speculation. It was a real physical model with a real testable prediction. A tiny black hole, they argued, moving fast enough and dense enough, could pass straight through the planet without releasing an underground shockwave — the rock’s rigidity would offer no resistance worth mentioning to something that small and that heavy. It would enter over Siberia and, following a near-straight line through the Earth, exit somewhere in the North Atlantic, between 40 and 50 degrees north, 30 to 40 degrees west. And when it exited, it should have produced its own shockwave — an air blast, an underwater disturbance, something a ship’s barograph or a shipping company’s log might have quietly recorded without anyone realizing what they’d caught.
That’s the part worth sitting with. Jackson and Ryan didn’t just propose something wild and walk away. They handed the rest of the scientific world a coordinate, a time window, and a specific signature to go check. That’s what separates a real hypothesis from a story — not how strange it sounds, but whether it tells you exactly where to look if it’s wrong.
People looked. Researchers combed shipping records and oceanographic data for the Atlantic exit event the theory demanded. Nothing matched. By 1974, a follow-up paper in the same journal — “Tungus Event Was Not Caused by a Black Hole” — closed the door, and by the late seventies the idea was, in the physics community’s own unglamorous phrase, buried.
What strikes me isn’t that someone proposed a black hole. Mysteries invite that; Tunguska has also attracted natural gas explosions, secret Tesla experiments, and a dozen other explanations serious and not. What strikes me is how fast and how completely a real scientific claim can be tested and closed, provided it’s specific enough to fail. The asteroid-airburst explanation isn’t the leading theory today because it’s the most exciting one. It’s the leading theory because, unlike the black hole, nothing has yet shown up to contradict it — and everyone still knows exactly what would.
That’s the quieter cousin of the question the video asks. Not just “how would we know if it happened again,” but: when the evidence runs out, what actually earns the right to fill the gap? Not the most dramatic answer. The one that told you, in advance, how to prove it wrong.
Sources: Tunguska event — Wikipedia; Britannica; NASA “115 Years Ago” retrospective; Jackson & Ryan, “Was the Tungus Event Due to a Black Hole?”, Nature (1973); Beasley & Tinsley, “Tungus Event Was Not Caused by a Black Hole,” Nature (1974).