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If the Earth is travelling through space at about 4000 MPH then if I launch a space ship from earth in the opposite dirrection of orbit AND..... if I have rear view mirror ...would the earth appear to be travelling away from me at 4000mph Plus my speed of travel in the opposite direction? also if i traveled on a spacecraft out of the Earth's gravitational field and I wanted to return to Earth! then it wouldnt be where I left it ! so do I have to hang around in space until it comes passed and then "jump" onto a planet travelling at 4000mph???