2. Theres No Gravity On The International Space Station (ISS)
Youve probably seen various videos of astronauts floating around on the ISS spending months with no gravity, even learning to play zero-gravity football. However, Earths gravity on the ISS is not that far off the gravity that keeps our feet on the ground. In reality, to reach a point where the gravitational pull of the Earth has no effect would require travelling impractical distances. At just 400km away, the Earths gravity at the altitude of the ISS is only slightly weaker than at the surface of the Earth itself. Objects in space are typically moving sideways in relation to the surface of the Earth, and despite the gravitational pull, the speeds with which they are moving across the Earth mean they will generally not get closer to its surface due to its curved nature. This means that they are in a constant free fall not actually at zero gravity.
