Part 4/11:

On the other hand, traversable wormholes are theorized to allow for movement from one point to another safely. These types typically require the presence of exotic matter—an unusual form of matter with negative mass—to stabilize the throat of the wormhole. Various models exist for these traversable wormholes, including those proposed by Kip Thorne and Matt Visser, which vary significantly in their exotic matter requirements and structural designs.

## Types of Traversable Wormholes: One-Way and Two-Way