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.

"We are able to make miniature stars, 'cause fusion is the same reaction that powers the Sun and stars," said Tammy Ma, who leads the Fusion Energy Initiative at the National Ignition Facility ...

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 ...