British startup Pulsar Fusion has come up with a wild new concept for a nuclear fusion-powered space rocket that, it claims, could significantly cut down the time it takes to travel to Mars in half. As CNN reports, the UK Space Agency-funded company’s Sunbird rocket harnesses the power of nuclear fusion, the same process that powers stars, as a form of propulsion. “It’s very unnatural to do fusion on Earth,” Pulsar Fusion founder and CEO Richard…