送交者: cornbug 于 2005-2-05, 12:49:03:
回答: 组图(3) 由 cornbug 于 2005-2-05, 12:47:50:
Titan's surface with an ethane river
A meandering ethane river flows beneath a line of bluffs on Titan. Methane fog blankets the lowlands beyond to the horizon. Attempts to glimpse Titan's surface from Earth-bound observatories and interplanetary probes have been thwarted by the thick hydrocarbon haze that covers the moon at all times. Since very little is known about the frigid world that lies beneath the haze, one can only imagine the exotic landforms a visitor might find. Titan's surface would likely be considerably darker to human eyes than these images suggest due to its great distance from the Sun.