But these haze particles, it was surmised, before we got there with Cassini, over billions and billions of years, gently drifted down to the surface and coated the surface in a thick organic sludge.
Innan vi kom dit med Cassini trodde man- -att dessa sotpartiklar under många miljarder år- -sakta hade sjunkit och lagt sig på ytan- -som en tjock organisk sörja.