Scientists discover a three billion-year-old crater in Greenland

[Wales Online]   Scientists have discovered a three billion-year-old crater in Greenland believed to be the largest and oldest on the planet. Cardiff University scientists were at the heart of a project which discovered the site where a huge asteroid struck – resulting in an apocalyptic fireball engulfing earth.... If the meteor, thought to have been as much as 30 kilometres across, struck today all life would be destroyed.