A recent scientific study has revealed that Earth once possessed rings similar to Saturn's approximately 460 million years ago. Learn about this fascinating discovery and its implications for ...

had been used as evidence to support the theory that plate tectonics started nearly as soon as Earth had solid ground — roughly 4 billion years ago. "That's probably a flawed argument now ...

The study also provides a new approach to solving one of the biggest enduring scientific mysteries: when did plate tectonics begin?