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The universe is absolutely huge. Even in our local neighbourhood - the Milky Way - distances are awesome. For instance, the nearest that Mars ever gets to Earth is 56 million km. So when they want to send a rocket to Mars, they have to calculate everything right down to the smallest fractions. If they send it in a direction only half a degree out, they'll miss Mars altogether. And a miss is a miss whether they miss by 1,000 km or a million km. Life is a little bit like that: A few little changes here and there, a few detours along the way can make the difference between hitting the mark and missing the mark.