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You know, back then, back then it was the blackbody radiation.

One of the well-known historical examples involves the discovery of the Planck spectrum of blackbody radiation, which could not have been explained by classical physics and which ushered in quantum mechanics.

His best-known work included his collaboration with Roger Penrose on gravitational singularities, the prediction that black holes emit blackbody radiation, and the best-selling book A Brief History of Time.

The light emitted by a hot object is called “blackbody radiation,” and has some interestingly simple properties.

This one’s for the geeks, from The Curious Astronomer: Derivation of the Rayleigh-Jeans law for blackbody radiation – part 1.