The History of Physics Podcast

In this episode we trace how a 23‑year‑old Aryabhata, in 499 CE, argued that Earth rotates on its axis, using eclipse observations and geometry to calculate a sidereal day and circumference. We explore how his daring claim challenged the prevailing Greek and Vedic models, sparked debate across India and the Islamic world, and laid groundwork for later astronomers.

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An unexpected hiss in a Bell Labs horn antenna turned into proof of the Big Bang. In this episode we trace how Arno Penzias and Robert Wilson’s meticulous measurements, Robert Dicke’s theoretical predictions, and the ensuing confirmation reshaped cosmology and set a new standard for observational science.

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In this episode we trace the moment when Lise Meitner spotted barium in irradiated uranium and realized a nucleus could split, sending Otto Frisch to confirm it. The discovery of nuclear fission not only unlocked atomic energy but also reshaped global politics through the Manhattan Project and the rise of nuclear power. Join us as we follow the science, the people, and the geopolitical ripple that followed.

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From Alexandria’s star charts to Copernicus’s heliocentric tables, Ptolemy’s system of circles upon circles kept astronomy alive for a millennium and seeded the iterative modeling that underlies Newton, Maxwell, and today’s data pipelines. The episode traces how this geometric trick bridged cultures, institutions, and scientific epochs.

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This episode traces how Einstein’s early mass‑energy idea evolved into the discovery of nuclear fission, the birth of chain reactions, and the profound scientific, political, and cultural impact that followed—from 1905 relativity to 1942 Chicago Pile‑1 and beyond.

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This episode examines the famous but debated story of Galileo dropping weights from Pisa to challenge Aristotle’s ideas about falling bodies. We trace how the experiment—real or imagined—shaped the concept of uniform acceleration, influenced Newton’s laws, and sparked a broader debate about measurement standards in early modern science.

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Explore how the 11th‑century Persian scholar Avicenna introduced the idea of “mayl,” an early form of impetus that challenged Aristotle’s view and foreshadowed Newton's law of inertia. The episode traces the transmission of this concept through Islamic scholarship into European thinkers like Gassendi and Buridan, culminating in its influence on modern physics.

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Edmond Halley’s daring forecast of a returning comet set the stage for the first real test of universal gravitation. When the 1758 apparition arrived a few weeks late, astronomers uncovered Jupiter’s subtle tug on its path, sparking the development of perturbation theory that underpins modern celestial mechanics.

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Explore how the 14th‑century Oxford Calculators challenged Aristotle’s falling‑body law by applying geometry to motion, discovering that acceleration is independent of mass. Their work set the stage for Newton and modern kinematics, illustrating the power of translation and cross‑cultural scholarship.

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From the bustling agora of Abdera to the particle detectors at CERN, this episode traces how Democritus’s idea that all matter is composed of tiny, indivisible particles set the stage for modern chemistry and physics. We examine the philosophical roots, Dalton’s experimental confirmation, and how the atom has evolved into the sub‑atomic world we explore today.

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