V'gers a ship not a cloud, and it's actually only a couple of kilometres long, I seen a pic of it on a size comparison of loads of different SF ships, Babylons 5, ST, SW, BG, different kinds of anime stuff, and some real life things to compare, it's actually pretty reserved compared to some of the ridiculously big SW stuff. Oh BTW the cloud was 2AUs in diameter, that's twice the distance between the earth and the sun across. Back in '79 they weren't quite up on their measurements and it's size before the current edit was 82AUs in diameter!