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chemical cartography (Chemical cartography shows the distribution of elements throughout a galaxy — from lighter elements, such as hydrogen and helium, to heavier ones, such as carbon, nitrogen and oxygen.  space.com Alex_Odeychuk) | |||
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| chemical cartography (Chemical cartography shows the distribution of elements throughout a galaxy — from lighter elements, such as hydrogen and helium, to heavier ones, such as carbon, nitrogen and oxygen. space.com Alex_Odeychuk) | |||