Chinese rocket debris is expected to fall to Earth this weekend but it’s not clear when or where. The major space-power launched the first module of its new space station this week and also plans to build a lunar station in co-operation with Russia. But what are the rules of space – who makes them and how are they enforced? And what would conflict in space look like? Andrew Mueller talks to Chris Hadfield, Namrata Goswami, David Burbach and Christopher Newman.

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