[Answer] What NASA spacecraft was the first to orbit Mercury?

Step 1 : Introduction to the question "What NASA spacecraft was the first to orbit Mercury?"

...1. Voyager 2. Messenger 3. Mariner 4. Clementine

Step 2 : Answer to the question "What NASA spacecraft was the first to orbit Mercury?"

Messenger - NASA's Messenger was launched in August 2004. Its goal was to gather data about Mercury, which is the smallest and least explored of the four terrestrial planets. In 2011, it orbited Mercury, the first spacecraft to do so. The mission revealed that, like Earth's moon, Mercury may have thick ice deposits on its surface. The data collected also helped scientists understand more about the planet's gravity fields and inner core.:

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