The BepiColombo craft will test one hypothesis about the formation of this body. That hypothesis has to account for the fact that this body's core is unusually iron-rich, which explains its dipolar magnetic field. A ring of lava eruption remnants surrounds the Caloris basin on this structure, which lies antipodal to a patch of "weird terrain". Mariner 10 performed a flyboy of this body, which is currently orbited by the MESSENGER probe. This body has the largest orbital eccentricity and smallest tilt of all objects in its class, and it rotates 
The BepiColombo craft will test one hypothesis about the formation of this body. That hypothesis has to account for the fact that this body's core is unusually iron-rich, which explains its dipolar magnetic field. A ring of lava eruption remnants surrounds the Caloris basin on this structure, which lies antipodal to a patch of "weird terrain". Mariner 10 performed a flyboy of this body, which is currently orbited by the MESSENGER probe. This body has the largest orbital eccentricity and smallest tilt of all objects in its class, and it rotates three times for every two revolutions. The perihelion shift of this object by around 40 arcseconds per year matches the predictions of general relativity. For 10 points, name this planet, the closest to the sun.
The BepiColombo craft will test one hypothesis about the formation of this body.
Mercury