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Physical sciences/Physics/Mechanics/Classical mechanics/Dynamics/Thermodynamics/Convection

Data from the MESSENGER spacecraft suggest that Mercury’s core is much bigger than researchers had realized, and that the planet’s surface has been through an unusually active evolution.

For more than a century, researchers have been puzzled by the nature of the filaments known as the penumbra in sunspots. Understanding the structure of the penumbra, which surrounds a sunspot’s dark core, may help scientists explain the energy flow below the surface of sunspots. The research appears in the 10 June issue of the journal Science.