Can we really defend earth against an asteroid strike?

An asteroid strike of any significant size would almost certainly be the end of our time on earth. A meteor shower destroys the space shuttle and scientists realise that an asteroid strike is 18 days away and it will be an extinction level event. Known as DART, for Double Asteroid Redirection Test, this rocket is being designed to hit an asteroid and tilt it off course. One potential asteroid strike happened last year as a rock missed us by a mere 30,000 km, which in space terms means you feel the wind of the bullet. We just have to hope their aim is good, otherwise what we will see as an extinction event asteroid strike, they will see as ‘what a pity, they seemed such fun’.

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