US President Donald Trump announces his latest defence plan: The Golden Dome. Estimated at a cost of $175 billion, it is designed to shoot down advanced missiles heading towards the United States. Using both ground and space to detect incoming projectiles, it will far surpass a similar system used in Israel known as the Iron Dome. But critics say it could prove ineffective and upset the balance of world power. So might the scheme lead to the militarisation of space and threaten the global order? And could there be other motives behind Trump's announcement?

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