The ISS (International Space Station) is on an orbit \(420 \mathrm{~km}\) above the Earth's surface, and is moving with a speed of about \(7.66 \mathrm{~km} / \mathrm{s}\). What is the value of the acceleration of gravity \(g_{I S S}\) at that height? What is the acceleration \(a_{I S S}\) worth on a body inside the station? Why do we read in the newspapers that experiments are carried out inside the station in the so-called "microgravity" regime? Is this statement justified?