Sunspots are caused by the twisting of the Sun's magnetic field from rotating plasma.

Sunspots are caused by the twisting of the Sun's magnetic field from rotating plasma.

• A. The Moon's gravity distorting the surface
• B. The Sun's magnetic field twisting due to rotating plasma
• C. Solar wind impacting the surface
• D. Regions of constant brightness

Answer: (B)

Sunspots come from the Sun’s magnetic activity. The plasma in the Sun’s outer convective layer moves and rotates, twisting and amplifying magnetic field lines through the solar dynamo process. When these twisted magnetic fields rise to the surface, they form strong magnetic flux regions that inhibit the normal convection of heat. With less heat reaching the surface, those regions become cooler and appear darker than their surroundings. That cooling and magnetic concentration create the dark spots we call sunspots. So thinking about it, sunspots are best explained by magnetic fields shaped and twisted by rotating solar plasma. The other ideas don’t fit: the Moon’s gravity doesn’t produce the Sun’s magnetic features, solar wind is a stream of particles outward from the Sun rather than a mechanism to form these surface patches, and regions of constant brightness wouldn’t account for the distinct dark areas caused by inhibited convection.

Sunspots come from the Sun’s magnetic activity. The plasma in the Sun’s outer convective layer moves and rotates, twisting and amplifying magnetic field lines through the solar dynamo process. When these twisted magnetic fields rise to the surface, they form strong magnetic flux regions that inhibit the normal convection of heat. With less heat reaching the surface, those regions become cooler and appear darker than their surroundings. That cooling and magnetic concentration create the dark spots we call sunspots.

So thinking about it, sunspots are best explained by magnetic fields shaped and twisted by rotating solar plasma. The other ideas don’t fit: the Moon’s gravity doesn’t produce the Sun’s magnetic features, solar wind is a stream of particles outward from the Sun rather than a mechanism to form these surface patches, and regions of constant brightness wouldn’t account for the distinct dark areas caused by inhibited convection.