im a non-scientifically trained individual, who is toying with the idea of writting a sci-fi novel. I tend to prefer sci-fi that is based on realistic principles, and realistic results as that helps me maintain the "suspension of disbeleif" so key in making a good story. Ive also always been tremendously supportive of sceintific efforts and the scientific community, so getting a chance to talk to the "eggheads" is pretty cool in and of itself. :) Anyways, As a plot device, i want a ship, carrying a load of anti-matter to loose containment right inside the atmopshere of Venus, say 80 miles up. Im looking to blow maybe 60% of the cloud cover off the planet, crater it, and push into a slightly ellpiptical orbit, requiring a massive amount of international resources to move the planet correctly or destroy it so that it doesn't screw up the solar system. Anyways, as a rough estimate how much anti-matter would this take to accomplish, and are there any other effects that such a large explosion would cause that i should be cognacent of?