|
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
From April 10 to 14, 2014, the fourth guiyang international automobile exhibition will be staged at the exhibition center of guiyang international conference. The auto show by the guiyang city people's government, Chinese automobile circulation association, China automobile industry international cooperation co., LTD., is exhibition co., LTD. Jointly organized, guizhou daily newspaper group seec, guiyang is exhibition service co., LTD., guiyang RGL convention and exhibition co., LTD., guizhou landscape charm advertising companies to undertake together, the guizhou metropolis daily for media, guiyang is as an executive organizer, conference and exhibition service co., LTD
Teamwork in tug-of-war games
New Car Buying Tips--
2002 mercedes ml500 mpg
2010 mercedes e350 aux input
2004 mercedes g wagon for sale
2002 mercedes convertible
mercedes benz maryland
Copyright ?1998-2017 Technews Corp, All rights reserved
|
