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الأحد، 5 يناير، 2014

Satellite fixed or mobile? And why?



Satellites do not fly theories known flight because they operate outside the atmosphere and control the movement of laws and theories of astronomical taught in science " Mechanics orbits " {Orbital Mechanics}, they spin at very high speeds in orbit {Orbits} fixed and can not be stopped , and increase the speed of the moon whenever approached from the ground and less further away from the earth and therefore there is no fixed satellite .. Even communications satellites and television broadcasting , such as {Nile sat} , which is believed the majority of people it fixed because they direct the receiving antennas to then Athbtonha , they are also not static but rotates in a circular orbit over a specific point on the equator and the same speed as the earth's rotation seems like a constant for us Earth's surface.

Frequently asked questions in the field of space and satellite

Is satellite fixed or mobile ? And why?How to fly or how the moon revolves in its orbit does not fall ?How did the idea of ​​a satellite ? And why?What are the types of orbits of satellites ?What are the different tasks of the satellites ? Where are placed in space ?Ends when the life span of the moon ?How to get rid of the satellites after the end of life ?What is the importance of good design to the moon's orbit ?How is the moon's orbit is an industrial design ?What are the components of the satellite system ?What are the components of the satellite ?How is the launch of satellites ? What are the countries that have the potential of all?What are the analytical capacity of satellite imagery ?What is the difference between the images and radar Alkahrobesria ?What is the difference between satellite imagery and aerial photographs ?What is the military applications of satellite imagery ?What is the difference between the purchased images and pictures of Google Earth? Is Google Images Live or recorded ?

The Trojan asteroids And explain ideas


The mathematician Joseph Lagrange studied the so-called restricted three-body systems, where one
of the three masses is much smaller than the other two. In this case, to a very good approximation,
the two large masses (M1 and M2, with M1 < M2) follow a standard two-body Keplerian orbit,
while the small mass (m) moves in the gravitational potential generated by M1 and M2. Lagrange
examined quasicircular orbits: he determined that, in the corotating frame where M1 and M2 are
at rest, there are ve points of equilibrium for m, now known as the Lagrange points L1{L5. In
the inertial frame, the Lagrange points correspond to stationary orbits, which have the property
that the distance between m and M1 and M2 is constant at all times.
In the corotating frame, the Lagrange points L1{L3 sit along the line that joins M1 and M2;
these points are unstable, meaning that a small mass initially placed there will gradually veer
o (this did not keep NASA from placing the SOHO solar observatory at L1 in the Earth{Sun
system, and from planning the WMAP microwave-radiation anisotropy probe for L2, because
unstable orbits can still be corrected with thrusters). On the contrary, L4 and L5 are stable; they
sit roughly along the orbit of M1, respectively sixty degrees ahead and behind this mass. Apart
from mathematical arguments, we can nd evidence of their stability by looking up at the sky:
the L4 and L5 points of the Jupiter{Sun system are home to the two families of Trojan asteroids
(so called because they were given names associated with the Iliad ). Trojan asteroids have been
found also at the Lagrange points of Mars and Neptune.
When this assignment was originally written, no trojan asteroids of earth had been found.
However, a trojan asteroid of earth has now been discovered:
http://news.nationalgeographic.com/news/2011/07/1107128-trojan-asteroid-earth-planet-orbit-nasa-
space-science/
Caltech and students from around the globe met at Caltech in the summer of 2011 to compete
in the Caltech Space Challenge to design a mission to a near earth asteroid. They considered this
new trojan asteroid, 2010 TK7, but as the article explains, it is more di cult to reach than some
other known near earth asteroids. Once you are done with this assignment, which considers trojan
asteroids around jupiter, you may wish to model the 2010 TK7 orbit.