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The orbit of our planet around the sun is not oval indeed,it is "elliptical".....
It is because in our solar system sun is the greatest source of gravity.To cop up with that gravitational pull planets move in an elliptical orbit.If they will not move in an elliptical path they may get crashed into the sun's surface.
Arigatou!Hope it helped!
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Me too!!!
then answer fast!!
my question
huh then what causes summer and winter?+
huh then what causes summer and winter???
It is due to the gravitation effect of the sun on the earth 
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