We learned the composition of Titan's atmosphere
from the Voyager flybys:
| Planet | pressure (atm) | H2O | CH4 | CO2 | N2 | O2 | H2 |
|---|---|---|---|---|---|---|---|
| Titan | 1.5 | 0 | 0.01 - 0.06 | tiny | 0.82-0.99 | 0 | 0.002 | Earth | 1 | 0 to 0.04 | 0.000001 | 0.000335 | 0.781 | 0.209 | tiny |
We have also obtained a reflectance spectrum of Titan which
tells us a few things:
Among other things, it tells us why Voyager couldn't see the surface,
and what we can do if we do want to look at the surface.