hiiiii,
becoz the earth ,sun ,moon and other planets move as a system and dont move separately......held by the gravitational forces that exist b/n them.....................to make it simpler and to make u understand easier lets take a example............
this is an EXAMPLE only.................a similar case...........this is not wat happens in the system of earth ,sun and moon..........
take 2 ballons and tie them together with a considearably long thread { let there be space b/n them}...........if u leave them from a top of a building the distance of the balloons will change with respect to other bodies ......but not the distance b/n the balloons........................
OUR CASE:-
in our case the "thread" is nothing but the gravitational force...................there are a lot of systems like our in this universe and the distance b/n the various systems only change................................
hope u understand..........................do ask if u have any doubts...........
cheers!
Moderation Team
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