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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
Most babies do not have adverse reactions after vaccination. Some baby vaccinated will fever, headache, loss of appetite, needle eye redness and swelling, pain or inflammation such as scleroma, this is the general response to vaccines, this kind of reaction generally do not need special treatment, 2 ~ 3 days to recover on its own. Due to individual differences, such as allergic constitution, some vaccines may occur in cases such as rash, anaphylactic shock and other allergic reactions. This is an abnormal reaction and needs to be treated in the hospital. Also some babies vaccination is a disease of disease, or there has not yet found the basis of the incubation period after vaccination coincidence, known as coupling, coupling and vaccine itself has nothing to do.
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