The only very rugged part of the route is in crossing the Big Horn mountain, which is about 30 miles wide.

The principal or highest part of the mountain having changed its direction to east and west, I ascended it in such manner as to leave its most elevated ranges to the south and travelled north west over a very rough and broken country generally covered with snow.

The weather was fine, the valleys literally covered with buffaloe, and everything seemed to promise a safe and speedy movement to the first grove of timber on my route, supposed to be about ten days' march.

These mountains appear to be almost entirely composed of stratas of rock of various colours (mostly red) and are partially covered with a dwarfish growth of pine and cedar, which are the only species of timber to be seen.

The moon is very rugged.

As a planetary scientist, I don't know what else to call Pluto: It's big and round and thousands of miles wide.