The discovery of a massive crater formed by the impact of a meteorite more than three billion years ago is changing the way scientists view the history of Earth and the planet's stages of evolution.

Early in the morning of October 6, 2008, astronomers at the University of Arizona detected an asteroid on a collision course with Earth. When other sightings cropped up across the world, the ...

Discovery and ancient beliefs -- Anatomy of a crater -- A meteoritic footprint -- How was Wolfe Creek Crater formed? -- Australia's impact record. The crater map of Australia -- Why formed by a ...