Here are ten scientific theories, once commonly accepted, that are no longer valid. What will be the next to drop?

Geocentrism: The belief that the Earth is at the center of the universe, with all celestial bodies revolving around it. 3.

2. Phlogiston theory: The theory that fire is caused by the release of an element called phlogiston.

3. Luminiferous aether: The concept of a hypothetical medium through which light waves were believed to propagate.

4. Caloric theory: The idea that heat is a fluid-like substance called caloric that flows from hot to cold bodies.

. Ptolemaic system: A geocentric model of the solar system proposed by Claudius Ptolemy, which included epicycles to explain the motion of planets.

Vitalism: The belief in a vital force or life energy that distinguishes living organisms from inanimate matter.

Steady-state theory: A cosmological model suggesting that the universe is continuously creating matter to maintain a constant density as it expands.

Spontaneous generation: The belief that living organisms can arise from non-living matter.

Miasmatic theory of disease:The theory that mental faculties and personality traits can be determined by studying the shape and bumps on the skull.

Miasmatic theory of disease: The idea that diseases, particularly infectious ones, are caused by noxious or foul-smelling gases or "miasmas."