送交者: cornbug 于 2005-2-05, 12:47:50:
回答: 组图(2) 由 cornbug 于 2005-2-05, 12:46:28:
Looking for life on Titan
A robotic probe from Earth explores a frigid ethane lake on Titan. The probe carries its own light source as the surface of Titan may otherwise be quite dark due to its thick atmosphere and great distance from the Sun. The probe is built like a shiny steel thermos in order to help insulate it from Titan's staggering cold.
Titan is host to a plethora of organic (carbon-based) compounds, hence this is one of the few places in the Solar System where life outside of the Earth may have evolved. In many ways, Titan resembles a frozen primordial Earth, though the greatest obstacle to Titan harboring life--as we know it--is the extreme cold. Even though all the chemical ingredients are present, Titan simply may not be warm enough to initiate the chemical reactions required for life.