What determines the shape of the Sun's corona?

• A. Its shape is determined by the solar wind.
• B. Its shape is determined by the Sun's gravity.
• C. Its shape is determined by the distance from Earth.
• D. Its shape depends on the Sun's magnetic field.

Answer: (B)

The shape of the Sun’s corona is governed by its magnetic field. In the corona, the plasma is highly conductive, so magnetic forces dominate over gravity and shape how the gas moves. The magnetic field lines guide the hot plasma, creating loops where field lines are closed and bright structures, and open field regions where lines extend into space, forming coronal holes and guiding the solar wind. This magnetic geometry sets the overall outline of the corona. Gravity does influence particle motion, but it doesn’t sculpt the large-scale structure the way the magnetic field does. The distance from Earth only changes how we view it, not its intrinsic shape. The solar wind is a consequence of this magnetized, expanding plasma and follows the field lines, not the primary shaping force itself.