Eco-friendly alternatives to fossil fuels are venturing beyond Earth—and into space.

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While this latest test doesn’t make nuclear-powered rocket engines viable just yet, it’s an important step on the journey. This latest batch of tests was conducted at the compact fuel element ...

The rocket was designed to replicate the first stage of a reusable flight, reaching around 75 kilometers before performing a reentry burn and making a powered descent and splashdown into the ...

It's been over seven years since Elon Musk first teased the second-generation Tesla Roadster, a futuristic sports car promising jaw-dropping acceleration and a rocket-powered boost. Yet ...