Starting off a kilometre high, travelling at the speed of a jet aircraft, and heading for us. It doesn't make for a good outcome. Hollywood-style graphics and real-life archive bring home an imagined near-future scenario, all based on cutting-edge science. —Trevor
| Tagline | |
| Release Date: | Apr 18, 2013 |
| Genres: | Documentary |
| Production Company: | Discovery UK, BBC |
| Production Countries: | |
| Casts: | |
| Status: | Released |
| Budget: | $0 |
| Revenue: | 0 |
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