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Buck lives with Judge Miller in California, a lapdog challenging comforts that the judge offers him with. When gold is discovered in Canada, Buck's life changes forever. Judge Miller's gardener sells Buck to dog traders, who beat Buck and treat him cruelly. Francois and Perrault, two mail carriers in Canada, buy Buck in the traders. Buck learns how to work along with the rest of the pack, anf the husband is appalled by the violence he sees one of many dogs. Spitz, the lead dog from the pack, is very violent, and slowly Spitz and Buck become rivals. Eventually, Buck kills Spitz and becomes the lead dog with the pack, helping them to make the trip in record breaking speed.
Space probe according to the detection of object is divided into lunar probe, probe and interplanetary spacecraft, small body such as a space probe to leave the speed of the earth must be large enough to overcome or get rid of the earth's gravity, realize the deep space flight. The probe orbits the heliocentric elliptical orbit (double-cut orbit) that is tangent to the earth's orbit and the planet's orbit, and may meet the target planet; Increase speed to change the orbit, flew to target the planet can shorten the time in order to ensure the detector fly the double track to the planetary orbits and tangent with the target when the target planets also run to it, must be chosen in the earth and the target planet at a particular moment of relative position detector. Detector can fly around the star, the use of planetary gravitational fields accelerate continuous multiple planets orbit the significant characteristic of space probe is, flying in space for long time, the ground cannot real-time remote control, so must have the ability of autonomous navigation; To fly outside the solar system, away from the sun, solar arrays, and nuclear energy systems; It is necessary to adopt special protective structure to withstand very severe space environment. Landing or walking on the surface of the moon or planet requires some special form of structure
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