Grav­ity on the In­ter­na­tional Space Sta­tion is ac­tu­ally about 90 per cent of grav­ity on the ground

Sky at Night Magazine - - MYSTERIOUS GRAVITY -

Or­bit­ing at an alti­tude of only 400km above Earth, the In­ter­na­tional Space Sta­tions (ISS) is so close to our planet that grav­ity barely dif­fers from what is ex­pe­ri­enced on the ground. As­tro­nauts are weight­less for the same rea­son as some­one un­for­tu­nate enough to be in a lift af­ter its ca­ble has snapped – be­cause, as fast as they fall to­wards the lift floor, the lift floor falls away from them. It is not ob­vi­ous that the ISS is fall­ing. That is be­cause it has sideways mo­tion. This means that, as fast as grav­ity curves its path down to­wards the Earth’s sur­face, the Earth’s sur­face curves away from it. ISS there­fore falls for­ever in a cir­cle, never reach­ing the

To us it ap­pears as if these ap­ples are float­ing; in fact they are fall­ing, only float­ing be­cause the ISS is fall­ing too

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