The Nebra sky disk, one of the oldest concrete depictions of cosmic phenomena, was created in the first millennium BCE, roughly 1,000 years later than previously assumed, according to new research by German scientists. The Nebra sky disk. Image credit: Dbachmann / CC BY-SA 3.0. The Nebra sky disk is a bronze disk of around 32 cm (12.6 inches) diameter and a mass of 2.2 kg, having a blue-green patina and inlaid with gold symbols. The metal artifact...
