Gravitational Anomalies of Mercury
The robotic MESSENGER spacecraft that had been orbiting planet Mercury for the past 4yrs (using radio waves) with precise energy. Mercury's gravity slightly changed this energy when measured on Earth (enabled the reconstruction of a gravity map of unprecedented precision). Red hues are areas of slightly higher gravity and unusually dense matter under the surface. The central area is Caloris Basin (impact feature measuring about 1,500 kms across). Last week, the MESSENGER was purposely crashed onto Mercury's surface after fulfilling its' mission.
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