Natural Entrance, Carlsbad Caverns National Park, New Mexico Carlsbad Cavern includes a large cave chamber, the Big Room, a natural limestone chamber which is almost 4,000 feet (1,220 m) long, 625 feet (191 m) wide, and 255 feet (78 m) high at the highest point. It is the third largest chamber in North America and the seventh largest in the world.
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Multi-stage fracturing and horizontal drilling have allowed natural gas supply to grow in North America, and if these techniques continue to be implemented, the door will be open for a number of countries to start producing potentially vast amounts of energy.
NO BIG Deal, Just NASA reporting on 'Near Earth Objects'. By-the-way, NASA actually gives the probability of asteroid impacts based upon calculated orbits of known threats. The fun part is, they're finding new threats every week! I'd say you should check it monthly, but really, if a major asteroid is going to strike Earth i'm sure 'Harry Stamper' will let us know :)