For rebirth Why do we have to return to earth why not to a planet far off in a different galaxy?

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Question is for rebirth & Why do we have to return to earth why not to a planet far off in a different galaxy?

Also read :King janak of mithila

Answer - 

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Not every living entity who dies on earth returns. There's no visual or other proof that every living entity who are dying will surely return again.  This misconception rises in those people who really don't know universal laws of nature. Destination of a soul after death is fixed after scrutiny of past & present actions. 

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