Misc

NASA can't explain mysterious coronal hole at south pole of sun.

"Coronal holes were first seen in images taken by astronauts on board NASA's Skylab space station in 1973 and 1974. 

They can be seen for a long time, although the exact shape changes all the time. 

The polar coronal hole can remain visible for five years or longer. "

That was when it was cold and scientists warned of a coming ice age.