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The atmosphere of Pluto is made up of Methane (only gas detected) 

Pluto

	Atmospheric Composition
	Density
	Diameter
	Distance from Earth
	Distance from Sun
	Eccentricity
	Escape Velocity
	Gravity
	Mass
	Reflectivity
	Revolution Period
	Rotation Period
	Rotational Velocity
	Satellites
	Syndotic Period
	Temperature
	Tilt of Axis