The study shed light on the June 27, 1931 “Tadaoun Meteorite,” named after the town in southern Tunisia, where local residents saw a fireball explode and hundreds of meteorite fragments fall.
Scientists used argon-argon radiometric dating (a method of measuring radiation from the elements argon) to determine the meteorite's age.
It's based on looking at two different isotopes (versions of elements that have more or less particles called neutrons).
Certain argon isotopes in samples are known to increase at a known rate with age, which enables scientists to estimate a sample's age by comparing the ratio between two different isotopes.
Using an electron microscopy technique called electron backscatter diffraction, the team also evaluated the distortion caused by collisions, known as impact phenomena.
The study indicates that “4 Vesta” saw a series of impact events until a cataclysmic event occurred 3.4 billion years ago. (Russia Today)