The time nighs for Huygens to plunge onto Titan

[whabang]

There was talk about building an eventual probe on ISS, to minimize the risk of contamintating it.

[whabang]

we have a duty to ensure that what will one day becomes space junk won't contaminate other worlds

Quite the contrary; It's our duty to contaminate as many worlds as possible. We cannot live on such worlds, but some Earth-organisms would thrive there.
It's all about evolution; survival of the fittest and all of that.

[whabang]

KennyR wrote:
Statistically speaking, that fittest isn't likely to be us when you take the whole galaxy into account. ;-)

No, but some primitive bacteria might be. :-D