Have you seen the new photos of Pluto from Hubble?
It is reason 1,000,999 why we need a manned space program (to service Hubble).
“...The images show a mottled surface the colour of molasses, which have changed in shade as its ice melts and refreezes with Pluto’s seasons. They reveal that the dwarf planet became redder and its northern hemisphere brighter between 2000 and 2002.
Pluto’s dynamic seasonal changes are unusual in that they are caused principally by variations in its 248-year orbit around the Sun, rather than by its rotation as are the seasons on Earth.
Marc Buie, of the Southwest Research Institute in Boulder, Colorado, who led the study, said: “The Hubble observations are the key to tying together these other diverse constraints on Pluto and showing how it all makes sense by providing a context based on weather and seasonal changes, which opens other new lines of investigation.”…”