After almost eight years and a 10-billion-kilometer slalom through the inner solar system, BepiColombo just kicked its cruise stage loose and started the final run at Mercury. Two spacecraft — one European, one Japanese — that have been riding piggyback since 2018 finally uncoupled from their transport module on Thursday. Controllers in Germany waited two tense hours for the radio confirmation to crawl back across 200 million kilometers. When it arrived, the room exhaled. The pair now have only about 3.3 million kilometers left before they slip into orbit in November and split into two independent probes in December. Getting this close to the Sun’s nearest neighbor is brutally hard. Mercury sits deep in the solar gravity well; you can’t just point and fire. BepiColombo needed nine planetary flybys — Earth, Venus, and Mercury itself — just to bleed off enough speed to be captured. The last swing-by in January 2025 already delivered crisp photos of cratered plains and strange, bright hollows. Those hollows are one of the planet’s many contradictions. Daytime temperatures can roast the surface at 427 °C, yet the poles hide permanently shadowed craters packed with water ice. A dense iron core generates a magnetic field no one fully expected from such a small world. Minerals appear to be boiling off the rocks, slowly eating pits into the landscape. Only two spacecraft have ever visited before; most of Mercury is still a mystery. The hardware has to survive what one engineer compared to “operating with a very hot pizza oven running right on your back.” Science operations begin next spring: dual orbits, dual instrument suites, and the first comprehensive look at the magnetic field, interior, and surface processes of the solar system’s smallest planet. The long, looping journey is almost over. The real work is about to start.
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