Max Planck — "The history of science shows that even the most firmly established theories can …"
The history of science shows that even the most firmly established theories can be overturned by new discoveries.
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Understanding this quote
What it means
Scientific knowledge is never final. Ideas that seem rock-solid, backed by decades of evidence and expert consensus, can still be replaced when better experiments or observations reveal something unexpected. Progress in science depends on staying open to evidence that contradicts what everyone already accepts. The quote warns against treating any theory as untouchable truth and reminds researchers that certainty is always provisional, not permanent.
Relevance to Max Planck
Planck lived this firsthand. Trained in classical thermodynamics, he reluctantly introduced energy quanta in 1900 to solve the blackbody radiation problem, shattering the continuous-energy assumption that had defined physics for centuries. His work helped replace Newtonian certainties with quantum mechanics. He famously remarked that science advances one funeral at a time, because even he initially resisted the radical implications of his own discovery about energy packets.
The era
Planck worked during physics' most turbulent upheaval, roughly 1900 to 1930. Classical Newtonian and Maxwellian frameworks, considered nearly complete in the late 1800s, were demolished by quantum theory, relativity, and atomic structure discoveries. Einstein, Bohr, Heisenberg, and Schrodinger reshaped reality itself. Planck witnessed entire textbooks rewritten within his career, watched peers reject new ideas, and saw Germany's scientific dominance crumble under Nazi rule before World War Two scattered researchers across continents.
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