ISS is in the low Earth orbit, at about 408 km. Earth's atmosphere technically stretches out as far as 630,000 km. Even outer space is not completely empty.

As for the speeds involved, there's a reason they employ legions of eggheads to figure this stuff out, it takes complex math to pull it off. That's what rocket science is. Also, computers.

ISS is in the low orbit Earth orbit, at about 408 km. Earth's atmosphere technically stretches out as far as 630,000 km. Even outer space is not completely empty.

As for the speeds involved, there's a reason they employ legions of eggheads to figure this stuff out, it takes complex math to pull it off. That's what rocket science is. Also, computers.