Sunday, 18 November 2012


There was a big splash recently about the Voyager spacecraft, launched in 1977, being ‘at the edge of the Solar system’. So is it out of the Solar system yet? How would we know – there’s no boundary sign, equivalent to ‘Welcome to Glorious Gloucestershire’?

Anyway, is there really an edge to the system? Doesn’t radiation etc just keep getting weaker and weaker for ever?

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