Labels:funnel | monitor | sky | vase OCR: STRUCTURE Composition Little is known about the composition of Pluto, but its low density (about twice that of water) indicates major constituent must be methane and water ice The remainder is probably silicate rock, perhaps in core surrounded by an icy mantle. Although no clear surface detail has been seen on Pluto, there appears to be dark band near its equator Pluto's diameter is about 300 km (2/3 the size of our moon); Charon's is approximately 1200 km. The two are so close in size that they are some times called "double planet Together, Pluto and Charon have about 1/5 the mass our Moon. aoubt diametel
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