http://itunes.apple.com/us/app/anti-comet/id534875289?mt=8 lot of 7-mile wide UFO , are flying to our Earth! Dr. Wolf realizes that the object are comets, and calculates that they will hit the Earth. You, be a hero will fly to the space and destroy all of them.They can be destroyed with missiles or nuclear weapons , or called the airplane... ============ A comet is an icy small Solar System body (SSSB) that, when close enough to the Sun, displays a visible coma (a thin, fuzzy, temporary atmosphere) and sometimes also a tail. These phenomena are both due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. Comets have been observed since ancient times and have traditionally been considered bad omens.