Titan (NASA), Sonnet #374

Saturn’s moon is the mysterious one
Among the globes of gas and crusty orbs
That meander about our unfixed sun.
The elements earth has and will absorb
In infinite (call them) hours, from the lab
Of the solar system, have been stored up
In planets and moons, each drop in its cup,
No two the same, each its own unique tab.
Titan, though, would seem an alternate birth,
With oceans and sand, with mountains and rain,
(Even if what falls is only methane),
A negative of our radiant earth.
What swims in water seas under a sky
Of nitrogen? And, if something does — why?