Challenges of Moon landing: the trajectory confusion
 
       With the modern era of science, development in space technology is growing beyond imagination. But, prospects of space mission is too complicated as it seems.            Distance from Earth to Moon is approximately 3.84 lakh km.      Moving from one point to another within Earth's atmosphere is heavily influenced by gravity of Earth i.e 9.8m/s*s,   But moving from Earth to Moon i.e traveling 3.84 lakh km includes various influences:    Non-uniform gravity between Earth & Moon  The gravitational pull between Earth & Moon is not usual as two persons next to each other in space. As defined by Newton's law of universal gravitation that 'every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers'.         Two objects under gravity [free fall]    Earth & Moon too attract each other. But at t...