Nonetheless, by the end of the 19th century new experimental evidence difficult to explain using the Newtonian theory began to accumulate, and the novel theories required to explain this data would soon replace Newtonian physics. The orbit of Mercury, which could be predicted very accurately using Newton's equations, presented a small but disturbing unexplained discrepancy between the observations and the calculations. Materials at very low temperatures do not behave according to the predictions of Newtonian physics.
Newtonian physics predicts that an oven at a stable constant temperature has infinite energy.
The first quarter of the 20-th century witnessed the creation of the revolutionary theories which explained these phenomena. They also completely changed the way we understand Nature. The first two problems require the introduction of the Special Theory of Relativity. The third item requires the introduction of the General Theory of Relativity. As a result of these developments the formalism developed by Newton lost its fundamental character.