Readers reply: will we ever set up an outpost on another planet?

The long-running series in which readers answer other readers' questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

This week's question: Will there ever be world government, and would we want it?

Will we ever set up an outpost on another planet? Finnley Clarkson, Sheffield

Send new questions to nq@theguardian.com.