Low hills bend across South Africa. You could stand among them and miss the crater. Time has stripped away most of the hole and left its deep roots showing.
The Vredefort crash happened about 2 billion years ago. Models put the asteroid at 12 to 16 miles across (20 to 25 kilometers), more than twice Everest's height. It crushed rock and melted it. Then the deep floor sprang back up.
That bounce made a central uplift, a raised lump in the crater's middle. Rain and rivers later wore away the upper rock. The hills belong to the deeper part that survived.
Pick up the right piece of rock and the crash leaves a smaller clue. Shatter cones are grooved shapes made by shock waves. Quartz grains also carry damage from the blow. Those marks help tell an impact from an ordinary worn-down hill.
The crash bent layers that already held gold. It did not bring the treasure from space. Some bent layers survived while others wore away. Scientists still have to model the asteroid's exact size and speed because so much of the crater is gone. The strongest clues are the shocked rocks you can still find on the ground.
