Russia denies ICBM use amid doctrine changes, as Ukraine and Western officials dispute claims of a ballistic missile strike.
Alistair Brownlee, a two-time Olympic triathlon champion, retires at 36 after an illustrious career, with plans to explore other endurance challenges.
Astronomers capture first close-up image of distant red supergiant star WOH G64, revealing its egg-shaped cocoon of gas and dust as it nears its explosive end.
Russia denies ICBM use amid doctrine changes, as Ukraine and Western officials dispute claims of a ballistic missile strike.
Alistair Brownlee, a two-time Olympic triathlon champion, retires at 36 after an illustrious career, with plans to explore other endurance challenges.
Astronomers capture first close-up image of distant red supergiant star WOH G64, revealing its egg-shaped cocoon of gas and dust as it nears its explosive end.