Even if the tenth test succeeds, formidable technical hurdles remain -- from making the system fully and rapidly reusable at low cost to proving it can refuel super-cooled propellant in orbit, a ...

Elon Musk's xAI has open-sourced its Grok 2.5 model and plans to do the same for Grok 3 in the next 6 months. Musk had ...