Here’s what you’ll learn when you read this story:A research paper proposes a fully physically realized model for warp drive.This builds on an existing model that requires negative energy—an impossibility.The new model is exciting, but warp speed is still probably decades or centuries away.In a surprising paper, scientists say they’ve nailed down a physical model for a warp drive, which flies in the face of what we’ve long thought about the crazy concept of warp speed travel: that it requires ex...