The MESSENGER Spacecraft: How We First Mapped Planet Mercury

The MESSENGER spacecraft revolutionized our understanding of Mercury by becoming the first probe to orbit the innermost planet, completing a 4.9-billion-mile journey over 10 years. Its groundbreaking discoveries included finding water ice in Mercurys polar craters despite the planets extreme temperatures, revealing Mercurys large iron core, and providing the first complete maps of the planet's surface. The mission solved long-standing mysteries about Mercurys density, magnetic field, and geological history while operating in one of the most hostile environments in our solar system.