TeachMeFinance.com - explain coma
coma The term 'coma' as it applies to the area of space can be defined as 'A spherical cloud of material surrounding the head of a comet. This material is mostly gas that the Sun has caused to boil off the comet's icy nucleus. This gas shines both by reflected sunlight and light emitted by excited molecules. A cometary coma can extend up to a million miles from the nucleus'.
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