Deep Impact eliminating four: Why Temple One impact.

Temple One <P> Why crash </ P> <P> Pang Zhihao, the "Temple One" comet was discovered in 1867, running a lap around the sun to be 5.5 years. .Chose "Temple One" for a reason: First of all it has been 100 years of human understanding, are more familiar with its orbital characteristics, the rotation characteristics of the situation, and now it is in middle age, more representative .; Second, it relatively close distance of the Earth, the spacecraft reaches its nucleus is only half the time. .It is not a new activity type comets enter the solar system, not continuously erupting out of gas, easier to see the external characteristics of the nucleus, is conducive to study the internal structure of the nucleus; there is, it can fly away from the more recent Earth .where, after impact on the planet suitable for public observation. .</ P> </ p>.