Gesamtlänge aller Episoden: 6 days 9 hours 11 minutes
Neutron stars, astronaut recruitment and Yuri Gagarin are up for discussion this month...
There's five times more dark matter than regular matter, but what exactly is it?
Marking the fifth anniversary of his mission to the International Space Station, astronaut Tim Peake tells all...
Recognising 20 years of continuous occupation of the ISS, we bring you 7 astronauts in one show...