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		| Paper: | 
		H3+ in Dense and Diffuse Clouds, in our Galaxy and beyond | 
	 
	
		| Volume: | 
		344, The Cool Universe: Observing Cosmic Dawn | 
	 
	
		| Page: | 
		162 | 
	 
	
		| Authors: | 
		Geballe, T.R. | 
	 
	
	
		| Abstract: | 
		The basic properties of the H3+ ion are summarized, along with the crucial role of this molecular ion in interstellar gas phase chemistry. Some significant observations of H3+ in dark and diffuse clouds and in the Galactic Center are highlighted, together with the first tentative detection in an external galaxy. | 
	 
	
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