Astronaut @Astro_Wheels and @NASA scientist Sue Lederer (@badassity77) holding ancient extraterrestrial objects...
Britain's first official astronaut, Major Tim Peake, goes into orbit in 2015. But do YOU have the right stuff for space? Take our test, modelled on European Space Agency criteria, to find out...Take the test
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Astronauts Cady Coleman and Nicole Stott reflect on their journey to NASA
How NASA is preparing for the exciting next frontier in space: a mission to Mars
The ISS is the most expensive object ever built. More than 100,000 people from 16 countries were involved in its construction. Every 92 minutes, this 15-year-old laboratory and observatory orbits our planet. From Earth, it's visible to the naked eye as a white dot – hurtling through the sky at 17,500mph.
Since his presenting break on T4 in 1999, Dermot's become a household name on television and radio. He returns to Channel 4 for this groundbreaking season, hosting all three shows – including the two-hour live show on Sunday 16 March, 8pm.
Mike's clocked up a whopping 571 hours in space. He sent the first-ever tweet from space during his historic mission to repair the Hubble Telescope. Back on Earth, he's been CAPCOM – the voice of Mission Control heard by the astronauts on the ISS.
Koichi became the first Japanese commander of the International Space Station on 9 March 2014. During his 20-year career, he's logged over five months in space and is due to return to Earth from the ISS in May 2014.
Rick began his engineering career working on flight-control computers. He applied to be an astronaut nine times before being selected in 1996. Now a space veteran, with seven spacewalks under his belt, he's been orbiting since last November.
A colonel in the US Air Force, Mike graduated from NASA's Astronaut Class in 2011. He arrived back on Earth on 11 March 2014, after 166 days on-board the ISS. A life-long fitness freak, Hopkins fronts the Train Like an Astronaut series on YouTube.
Former Air Force colonel Cady Coleman was selected by NASA in 1992. Since then she has logged more than 4,330 hours in space aboard the Space Shuttle Columbia and the ISS. She advised Sandra Bullock on her role in the film Gravity.
Selected by NASA in 1996, Don is now a veteran of three space flights. In his time on the ISS he has logged over 370 days and 13 spacewalks, and carried out numerous on-board scientific experiments.
Nicole Stott went from structural design engineer to NASA engineer to astronaut after being selected for NASA training in 2000. Her second space flight, as a Mission Specialist on STS-133, which was the final mission for Space Shuttle Discovery.
Chris has flown more than 70 different aircraft as a military test pilot, been ISS commander and rocketed into the limelight after chronicling his life in space online. His microgravity rendition of David Bowie's Space Oddity has millions of hits on YouTube.
From aquanaut to astronaut, Ron has spent 18 days on the bottom of the ocean, more than 178 days in space and 27 hours and 3 minutes on four spacewalks. He completed his first spaceflight in 2008.
A decorated military veteran, Colonel Wheelock began astronaut training in 1998. As well as being NASA's Director of Operations - Russia, Doug has accumulated more than 178 days in space and conducted four emergency EVAs.
Major Tim is Britain's first official astronaut, beating more than 8000 European candidates for a coveted place in the European Space Agency. The Chichester-born engineer and former military pilot makes his first visit to the ISS in 2015.
Russian cosmonaut Mikhail graduated from the Moscow Aviation Institute in 1984 and was selected to begin training in 1993. He is currently on the ISS, his third expedition to the station.