Hello,
I realize this was posted below, but they neglected to mention my favorite place in the solar system besides Earth, Europa (and Ganymede). What size ocean lies under Europa's icy crust, and what precisely is it comprised of...
SpaceRef has it all.
I'm in my 30's, I hope know in my lifetime.
Enjoy, Vince
Europa:
Ganymede:
Not From New Horizons, but a False Color Image of Minos Linea Region on Europa. "Triple bands, lineae and mottled terrains appear in brown and reddish hues, indicating the presence of contaminants in the ice. The icy plains, shown here in bluish hues, subdivide into units with different albedos at infrared wavelengths probably because of differences in the grain size of the ice." Source
New Horizon's Tantalizing New Views of Europa, Ganymede, and Io