Aurora Australis: Atmospheric phenomenon in Earth's magnetosphere. Aurora Australis is located in the southern hemisphere.
Black hole: the result of a massive star collapsing. Gravity acts so strongly on black holes that nothing can escape it.
Brown dwarf: Collection of matter that could not achieve nuclear fusion.
Chromosphere: layer of the sun above the photosphere, usually only visible during a solar eclipse
Coronoa: outermost layer of the sun's atmosphere
GigaYear (Gyr): 1 billion years
Photosphere: visible surface of the sun
Protostar: cloud of gas that is beginning the process of nuclear fusion.
Last modified: Thursday, 8 September 2011, 8:57 AM