Hi there! I have not yet taken any physics courses at my high school and so am an utter neophyte to physical science but I am about to run a roleplaying game that involves superheroes, alien invasions, black holes, and weather control and I have a few questions that probably are simple to you but stump me. OK now to the questions! 1)I have heard a theory that the Tunguska event (http://en.wikipedia.org/wiki/Tunguska_event) was not caused by a comet but by a mini-black hole. What would happen if this was true? How do black holes work? 2)Now I do know at least one thing about physics; light speed isnt broken ever. So, how would aliens from millions of light years away reach earth if possible? I guess this is more of an astronomy question but still... 3)How do different dimensions work? Are there different dimensions? 4)Can the Earth's weather be controlled without breaking any laws of physics? Thanks a ton in advance!!