Aurora / © Tom Eklund
... And if the night sky on which we observe the planets is at a high latitude, outside this lecture hall - perhaps over a small island in the archipelago of Stockholm - we may also see in the sky an aurora, which is a cosmic plasma, reminding us of the time when our world was born out of plasma. Because in the beginning was the plasma.
Hannes Alfvén (30 May 1908 - 2 April 1995), Nobel Prize in Physics 1970
from his Nobel Lecture