U.K. start-up Pulsar Fusion has unveiled plans to build a fleet of reusable nuclear fusion-powered rockets, known as Sunbirds, that could cut journey times across the solar system in half.

Fusion energy could provide continuous, clean power without the hazards of nuclear or fossil fuels. Companies are investing in fusion energy, though no public stocks exist yet for direct ...

General Fusion announced on Tuesday that it had successfully created plasma, a superheated fourth state of matter required for fusion, inside a prototype reactor. The milestone marks the beginning ...