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摘要

If there is one thing that is consistent in this world, it is change. We may be fooled into a sense or constancy by the apparently stationary nature of Earth's geological make-up, or the habitual motion of celestial bodies - but warp the lens of time a little and a maelstrom of transformation is revealed. Despite this, it is one of the rules of the universe that energy is conserved - however violent or casual the change, the energy balance sheet must always add-up. Subatomic particles can pop and fizz in and out of existence, just as stars can form and collapse - as long as the energetic books are balanced then it can happen.