In 1920, a farmer named Jacobus Hermanus Brits was plowing a field in Namibia when his ox-drawn plow screeched to a halt against something buried inches beneath the soil. He had struck the Hoba meteorite, a roughly 60-ton, nine-foot-square slab of iron-nickel alloy that remains the largest intact meteorite ever found and has never been moved from where it fell. This episode investigates the puzzle it presents: an object that massive falling from space less than 80,000 years ago should have carved a crater like Meteor Crater in Arizona, yet there is none.

The answer lies in Hoba’s unusually flat, tabular shape, which gave it a drag coefficient around 1.3 and turned its atmospheric entry into a cosmic belly flop, bleeding speed from more than 10 kilometers per second down to a terminal velocity of roughly 2.75 kilometers per second. Because kinetic energy scales with velocity squared, that drop turned an explosive event into a mechanical one. We explain how its 84 percent iron and 16 percent nickel composition, an ataxite of chemical class IVB cooled slowly in an asteroid core, let it flex rather than shatter, how a crust of iron hydroxide protected it from rusting away, and then how humanity became its greatest threat through decades of souvenir hacking, a border war that stalled protection, national monument status in 1955, a donation to the state in 1987, and a 2.8-kilogram fragment sawn off by hand in 1968 that sold at auction in 2021 for over 59,000 dollars.

• The 1920 discovery, the formal report preserved at the Grootfontein Museum, and what the name Hoba means
• Why a flat shape and high drag coefficient explain the missing crater
• How nickel content makes iron ductile and why class IVB ataxite survived a Mach 8 impact intact
• The path from vandalism to national monument, the Otavi Triangle conflict, and the 1987 tourist amphitheater
• The Bonhams auction of a hand-sawn fragment and what it says about the human urge to own a piece of the cosmos