No spacecraft has ever ventured so close to the planet before, NASA said.
The first color images of Pluto's atmospheric hazes, returned by NASA's New Horizons spacecraft last week, reveal that the a fine blue tinge.
Located in Titan's stratosphere, the cloud is made of a compound of carbon and nitrogen known as dicyanoacetylene (C4N2), an ingredient in the chemical cocktail that colours the giant moon's hazy, brownish-orange atmosphere.
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