Virtual tour lets you imagine life as an astronaut trapped on the ISS

Astronauts Butch Wilmore and Suni Williams are stuck on the International Space Station for six months .

They have to sleep in phonebooth-sized bedrooms, use vacuum-powered toilets, and wear the same underwear for WEEKS on end.

You can take a virtual walking (or floating) tour of the ISS by following this link.

Every day begins at 6:00am sharp with a wake-up call from Mission Control back on Earth .

The ISS orbits Earth 16 times every 24 hours so NASA keeps the station on Greenwich Meantime for coordination.

NASA provides each of its astronauts with a personalised schedule which maps out their day in 15-minute intervals.

Astronauts need to consume 2,500 calories per day so NASA is careful to provide them with a three -course meal.

The International Space Station is a $100 billion ( 80 billion ) science and engineering laboratory that orbits 250 miles ( 400 km ) above Earth .

It has been permanently staffed by rotating crews of astronauts and cosmonauts since November 2000 .

The station has been continuously occupied for more than 20 years and has been expended with multiple new modules added and upgrades to systems.