- The authors made their discovery by examining data from a series of low altitude orbital passes undertaken by Messenger at heights often less than 50 kilometres above Mercury’s crater-strewn surface.
- Mercury’s global magnetic field provided scientists with evidence that the 2,440 kilometre wide planet still retains a partially molten iron core which acts as a geodynamo to produce the magnetic field.
- The finding that Mercury’s core dynamo field was present early in the planet’s history provides important insight into the evolution of the planet’s core and the dynamo action within it.
Scientists have found evidence of a four billion year old ancient magnetic field on Mercury
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