A 30-second explainer on why ESA is flying back to an asteroid NASA already hit

In 2022, NASA's DART crashed into Dimorphos, a 151 m moonlet of asteroid Didymos, in the world's first asteroid deflection test. ESA's Hera is set to arrive in November 2026 to survey the aftermath up close 🛰️ Visuals made with Grok Imagine. Sincere thanks to @imagine and @grok 🙏