So I don't feel as freaked out as I did before reading the Tips sticky about making sure every bit of science is plausible. I would like to try and keep it believable for the immersion though. http://gizmodo.com/could-the-sun-be-extinguished-by-a-bucket-of-water-just-1669914928 It all started with this article. My brain ran away with the idea of our solar system flying through a super massive cloud of water vapor or ice on it's journey round the galaxy. I suppose it's a given that the cloud is vast and not dense enough for it to form its own star. But there is enough to add significant mass to the sun eventually. My main hurdle is I am not sure if an interstellar cloud of anything would breach the suns bow wave and heliopause. If there were enough mass would parts of a super massive cloud be able to breach the system? I plan on having some fun with this like exploring mass added to some planets in the system, including earth. Thanks to anyone who takes time to post on this. Cheers!