Tuesday 13 May 2014
A near-perfect square ‘hole’ in the sun has been caught on camera by NASA.
The dark spot is known as a coronal hole, and is made when solar winds pull away from the sun at incredibly high speeds.
It appears dark in ultraviolet light because there is less material to emit the wavelengths.
Nasa said: “A coronal hole is an area where high-speed solar wind streams into space.
“Inside the coronal hole you can see bright loops where the hot plasma outlines little pieces of the solar magnetic field sticking above the surface.”