Space explained: What is the second space age (and why are billionaires involved)?

Space exploration has captured public attention for more than 80 years. Following the Space Race during the second half of the 20th century, space innovation gradually receded from public view. Now, private investment has set off a second Space Age, which is raising the stakes like never before. Mark Dickinson, Inmarsat Deputy CTO and VP, Space Segment explains why.