![]() After this, he declared, Earth will be sterilised by cold. In 1854, it was forecast by Scottish mathematician Lord Kelvin that there were only 300,000 years left. Physicists had started calculating how long the Sun could continue to shine for, but because they falsely believed that it generates heat by collapsing under its own weight, their estimates were far too short. The problem was that, by Victorian times, science's judgement on how much future lay ahead was somewhat austere.
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