Why the clockwork universe of Isaac Newton collapsed under the weight of relativity
In short: Physicist Neil Johnson explores the shift from a predictable, clock-like universe to the relativistic reality defined by Albert Einstein. This lecture, recorded in 1999, examines why our intuitive understanding of time as an absolute constant failed and what remains unknown about its forward-moving nature.
For two centuries following the founding of the Royal Institution, the scientific consensus viewed the universe as a reliable, clockwork mechanism governed by Sir Isaac Newton’s laws. While Newton’s framework successfully predicted planetary motion, it struggled with minor inconsistencies. By the end of the 19th century, Albert Einstein’s theory of relativity shattered this model by proving that time and space are interconnected, rendering Newton’s work a mere approximation.
Einstein’s discoveries established that time is relative and that the speed of light is an absolute limit, effectively ending the concept of universal time. Despite these breakthroughs, fundamental questions remain: why does time flow only in one direction, and does it have a definitive beginning or end? Johnson highlights the paradox of a universe that trends toward increasing disorder while simultaneously generating complex, ordered structures from chaos.
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Sources
- Summary by Intellect · source: Back to the Future - Neil Johnson's 1999 Christmas Lectures 1/5
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