Orbiting at 250 miles above the Earth, the International Space Station (ISS) has been integral to a bucket load of research over the past 25 years.
Surrounded by a dizzying number of controls and experiments, occupants get some shut eye in sleeping bags attached to walls that couldn’t be further from luxury if you tried.
But compared to the upcoming Lunar Gateway space station, which will orbit the moon when it is built later this decade, the ISS is decidedly