July 4 comet expert ideas of human artillery observation teach you how to.

<P> 2005 年 1 12, worth 330 million U.S. dollars, "Deep Impact" spacecraft was successfully launched in 431 million kilometers of space flight, space impact it will launch July 4 collision Temple One .comet's nucleus. .This is unprecedented in human history, "shelling" the comet in space experiments. .</ P> <P> comet Tempel One was discovered in 1867, running a lap around the sun to be 5.5 years. .It was chosen as the experimental subjects, mainly because of: its more than 100 years of human understanding, it is more familiar with the situation; present, the comet is in middle age, representative; can fly to the comet from the Earth .more recent local, impact on the earth after the appropriate public observation. .In addition, its location relative to the right, Deep Impact fired "shells" in a short period of time "hit" it. .</ P> <P> present, the human understanding of comets is still relatively small, the main stay in the understanding of the surface material. .In 1996, the United States three scientists de Mel, White Le Dayton and Hearn made to NASA comet crash program to uncover the secrets within the comet. .Impact in improving the navigation module system, the planned November 1, 1999 start. .</ P> <P> "shelling" comet is of great significance </ P> <P> comet bombardment experiments in space has entered the countdown, press the question of public interest to astronomers, Purple Mountain Observatory, Chinese Academy of Sciences researchers thought the king had an exclusive interview .. .</ P> <P> "both from a scientific perspective, or from the public appreciation of the level, on July 4 the 'shelling' comet in space experiments are of great significance." King of thought, during the event in 1994 .year "coma wood collision" hot spot after another astronomical event, the difference is, the last man to suffer in the passive observation of Jupiter hit the "tragic milestone", this was the man to turn defensive to the offensive, the initiative to hit comet .. .This is a human initiative fully reflected in the universe. .</ P> <P> from a scientific perspective, the impact process, the impact module will carry the camera toward the nucleus, captured a wonderful photo site, until the "heroic sacrifice" the first 2 seconds. .In the "line of duty" before, it has images and data back to the spacecraft. .Spacecraft itself with high-resolution cameras and infrared spectrometers and other sophisticated observation equipment, the comet is only 500 km away from the safe distance close shot hit the mushroom cloud when the sky, recording the size of craters, the depth, shape and .internal structure, analysis of material from the nucleus within the jet components, and observed the valuable images and data back to Earth. .</ P> <P> Because comets contain the most primitive solar system material, these images and data to help people kick the comet within the first secret, it would also help uncover the origin of Earth and even the entire solar system and universe, the mystery of the origin of life .. .In addition, these data also to prevent the comet provided valuable information. .</ P> <P> appreciation from the public perspective, this is the first time create their own wonderful planetarium, watch is very high. .At present, this astronomical event has attracted a large number of amateur astronomers. .NASA website (www.nasa.gov) in the "front page" with full-page description of this Deep Impact space experiment. .Amateur astronomers around the world have begun to telescope the comet Tempel One, the world famous "Hubble" Space Telescope, "Spitzer," Space Telescope, "Chandra" also prepared the Space Telescope .unprecedented astronomical event of a go. .</ P> <P> "shelling" the comet after the 4 possible </ P> <P> researcher thought the king, "shelling" is a man-made comet Sky, has not happened before, there are still many possible .sex. .</ P> <P> thought the king introduced the center of the comet Tempel One is a diameter of about 6 km of the nucleus, the nucleus by the large amount of water ice, carbon dioxide ice, methane ice and rock dust material composition. .July 4 Deep Impact spacecraft launched by the 370 kg giant hit like a tank shell, the universe will be 10.2 km speed crashed into the comet's nucleus, the energy equivalent of 4.5 tons of explosive high explosive, in which case .There are several possibilities occur. .</ P> <P> The first possibility is not hit the nucleus, the reason is the impact rather difficult, because the spacecraft "shells" and the comets in the universe to speed fast movement, and movement routes and .not in the same line, which is like riding horses in the fast-Benz, and want to fly with the arrows in the eagle, it is very difficult; </ P> <P> second possibility is that although the hit nucleus, but .As hard nucleus than expected, the play's impact craters is not large, less material sputtering out, brightening the comet is not obvious; </ P> <P> A third possibility is when the explosion generated by the impact of deep .no less than 30 m deep pit, a football field. .The moment of impact melt temperature evaporation of the material was produced as a brilliant fireworks festival scene, the sputtering gas out of the large amount of dust material to comet Tempel One shine, and last for days or even weeks old; </ P> < .P> The fourth is the comet's nucleus may be quite loose, disintegrating in the fierce bombardment, the nucleus into a few or all of collapse. .</ P> <P> the king thought that an estimated third more likely. .But note that the "shelling" took place 130 million km away from Earth, the Earth and the spacecraft can see the phenomenon of close observation is still very different. .</ P> <P> experts teach you how to observe the "shelling" comet </ P> <P> thought the king introduced the shelling of the comet is expected to occur in Beijing on July 4 13:52 PM, gun .H-6 half-hour after the comet will begin to enter our night vision. .This is conducive to China after the injection of public shelling out a lot of "blizzard" of gas and dust cloud observations. .</ P> <P> 6 月 26 ~ July 9, the comet Tempel One Star in the south after dark, in the constellation Virgo Jupiter and Spica star nearby. .The best night of observing time from dawn to start all black all black after two hours. .The brightness of the comet before impact about 11 other stars, the brightness may be enhanced after the crash several times, became a star, etc. 7. .Shelling before comet observation, preferably a diameter of 30 cm or more high-quality telescope. .For observations after the shelling, "the flames reaching the sky," the comet, with more than 10 cm diameter telescope it is possible to observe the comet's presence. .And photographed the historic event to the lens, with flexible CCD (electronic detectors) for the upper, can also be used as digital cameras. .</ P>.