A NASA spacecraft passed the planet Mercury. This photo clearly reveals the effect of meteor strikes on the surface. Their devastation is not so apparent from the space shuttle, unless you know where to look like in the Yucatan or polar areas, but most astronomers concerned with asteroids or comets are looking into the sky for the next threat to life on Earth greater than Man.
"Civilization killers" of 1 kilometer, or about 3,300 feet are veering closer and closer to Earth due to the planet's increased magnetic pull. Some missing by 29.8 million miles or a third the distance to the Sun. Smaller objects can impact on Earth with various degrees of destruction from not being able to watch TV to the flattening of Kansas and something as small as a semi-trailer could achieve that effect.
NASA reckons such an event occurs once every 300 years, but the odds are that it will fall into the ocean, sicnce Earth is 2/3 water. One way for we earthlings to defuse this problem would be for Americans to lose weight, since the earth's gravity pull is directly effected by the mass of the planet. NASA has been warned about the dangers of obesity, now is the time to act before it's too late.
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