https://www.newscientist.com/article/2170151-pluto-is-not-a-planet-its-a-billion-comets-squished-together/ > Pluto is chock full of nitrogen. Currently, it is found in gas form in Pluto’s tenuous atmosphere, and in solid form in giant glacier made of nitrogen-rich ice, called Sputnik Planitia, which is found in the left lobe of Pluto’s heart-shaped plain. > To continue reading this premium article, subscribe for unlimited access.