Before dawn on a July morning in 2007, a streak of fire crossed the sky above the Nullarbor and burned out high over the saltbush. No one was awake to see it. But cameras were. Two weather-proof observatories, staring patiently upward through the desert night, caught the entire flight on film - and from those two photographs, scientists did something that had never been done before. They calculated where the rock would land, drove out across the plain, and found it. They also calculated where it had come from: not just "space," but a specific orbit, a specific corner of the solar system. The meteorite they recovered is called Bunburra Rockhole.
Meteorites are common; meteorites with a known address are vanishingly rare. Most are stumbled upon long after they fall, with no record of where in the sky they came from. Bunburra Rockhole changed that. It was the first meteorite recovered by the Desert Fireball Network, a chain of automated cameras built specifically to photograph fireballs against the dark, flat, cloudless canvas of the Australian outback. When the network captured the fall in July 2007, researchers could triangulate the meteoroid's path from two separate camera stations and predict its impact point to within a hundred metres. The first fragments - a stone of about 150 grams and another of 174 grams - were found on the ground months later, exactly where the mathematics said they would be.
Knowing where a meteorite fell is useful. Knowing where it lived for the previous few hundred million years is extraordinary. Because the cameras recorded not just the brightness but the precise geometry of the fireball, the team could reconstruct the rock's orbit around the Sun before it ever touched the atmosphere. Bunburra Rockhole turned out to follow an Aten-type orbit - a path that loops mostly inside Earth's own. Tracing that orbit backward revealed the object had passed within a whisker of Venus, roughly four hundredths of the Earth-Sun distance, in September 2001. The modelling pointed to a 98 percent likelihood that the stone originated in the innermost region of the main asteroid belt, between Mars and Jupiter. For the first time, a rock in a laboratory could be matched to a journey through the sky.
Then the rock itself began to surprise everyone. At first glance it looked like a familiar kind of meteorite - a basaltic achondrite, born of ancient volcanism, of the sort usually traced to the giant asteroid Vesta. But its chemistry refused to fit. The ratios of oxygen and chromium isotopes locked inside the stone did not match Vesta's family at all. The conclusion was startling: Bunburra Rockhole came from a different parent body altogether - a small, long-vanished world that, like Vesta, had once melted, churned, and grown a crust before being shattered. It is evidence that the early solar system held many such miniature planets, each cooking up rock through its own complicated volcanic history, most of them now broken into pieces and scattered.
It is no accident that this happened here. The Nullarbor is one of the best places on Earth to hunt for fallen stars. The land is flat, pale, and almost treeless, so a dark meteorite stands out like a smudge on a tablecloth. Rain is scarce, so stones weather slowly and lie undisturbed for ages. The skies are reliably clear, which is exactly what a network of fireball cameras needs to keep watch night after night. The plain has yielded thousands of meteorites over the decades, but Bunburra Rockhole holds a special place among them - not the biggest or the oldest, but the first to arrive with its travel history fully written, recovered from a patch of South Australian saltbush thanks to a flash of light and a pair of waiting lenses.
The Bunburra Rockhole fall site lies at roughly 31.35 degrees S, 129.19 degrees E, in the Nullarbor Regional Reserve of South Australia, a short distance east of the Western Australia border and inland from the coastal cliffs of the Great Australian Bight. There is no landmark to mark the spot - just an unbroken expanse of low saltbush and bluebush stretching to a flat horizon, the very featurelessness that makes the plain ideal for spotting dark meteorites and tracking fireballs. Recommended viewing altitude is 4,000-7,000 ft AGL to appreciate the scale and emptiness of the plain. The nearest airfield is Eucla (YECL) to the southwest near the coast; Forrest (YFRT) lies to the northwest on the Trans-Australian rail line, and Ceduna (YCDU) is the nearest substantial airport, well to the east. Visibility is typically excellent, with calm, clear desert air most mornings - the same conditions that let the cameras do their work.