Tonight, in its new Monday night slot Tomorrow's World looks at the problem of space junk and potential collisions that could wipe out the Earth's communications satellite network. As more launches take place, a cosmic traffic expert is predicting that a series of collisions, dubbed the "cascade reaction", is inevitable.
Presented by Howard Stableford and Shahnaz Pakravan, with Vivienne Parry, Philippa Forrester, Jez Nelson, Rebecca Stephens and Craig Doyle.
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