Hot-Donut Earth? Planet May Once Have Taken on Odd 'Synestia' Form

Earth probably became a "synestia" for a brief period about 4.5 billion years ago. That's the term for a newly proposed cosmic object: a huge, hot, donut-shaped mass of vaporized rock that results from the collision of two planet-size bodies.

via Live Science http://ift.tt/2qV3KrC