What we are told about ISS or any other spacecraft in that same orbit. ISS is not floating in space but rather it’s falling around the Earth at 17,000 MPH in 90 percent gravity and is loosing 300 feet daily of orbital altitude due to drag and friction! 17,000 MPH is equivalent to 8 times the speed of a high powered rifle’s bullet. ISS is about the size of a 747 and therefore an object that size would never be visible 250 miles away when we can barely identify a commercial jet 5 miles away!