Not exact matches
Its two faces differ strikingly in color, likely the result of thermal segregation: Over time, darker materials (like carbon) have absorbed
more heat from the sun, warming up and sending lighter,
more volatile materials (like
ice) to the colder hemisphere.
Materials known to exist at Pluto's surface from ground - based spectroscopic observations include highly
volatile cryogenic
ices of N2 and CO, along with somewhat less
volatile CH4
ice, as well as H2O and C2H6
ices and
more complex tholins that are inert at Pluto surface temperatures.
Also, as the Arctic warms and the sea
ice becomes thinner, you do expect, even from theoretical calculations, that the extent will become
more volatile.