A slowdown at the sun’s surface explained
Escaping photons may slow the rotation of the star’s outer layers
![The Sun](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/03/021717_EC_sunrotation_main.jpg?fit=860%2C460&ssl=1)
SOLAR SLOWDOWN The sun’s surface rotates more slowly than its inner layers. Scientists now have an explanation: Photons leaving the sun could carry angular momentum away, slowing the top layer’s spin.
SDO/NASA