Every once in awhile, a kind of hole blows out in the Sun’s atmosphere — a “coronal hole,” as it is called. And it has happened again, this time on top of the Sun.
You can see it above in a sequence of images captured by NASA’s Solar Dynamics Observatory spacecraft, or SDO, in different wavelengths of light. Look for the big dark area on the Sun’s cap.
Not to worry! This is completely normal.
SEE ALSO: Has the Sun blown its top?
Ordinarily, the Sun’s magnetic field lines extend u