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STUDY: Vocabulary

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Picture of the Sun taken from Moscow. Photo courtesy of


Astronomical Unit: Distance from Earth to the Sun; about 150 million kilometers.

Aurora Borealis: Atmospheric phenomenon in Earth's magnetosphere. Aurora Borealis is located in the northern hemisphere.

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.

GigaYear (Gyr): 1 billion years

Protostar: cloud of gas that is beginning the process of nuclear fusion.

Main Sequence: Longest part of a star's lifespan. Stars with larger mass have shorter main sequences. Stars with smaller mas have longer main sequences.
Last modified: Tuesday, 27 April 2010, 4:42 PM
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Earth Systems (A)