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Geophysicists are scientists who study the Earth using principles of physics. They analyze physical properties and processes of the Earth to understand its structure, composition, and dynamics. This can include investigating the Earth's gravity field, magnetic field, seismic waves, thermal characteristics, and the behavior of fluids within the Earth's subsurface.

Physical chemists are scientists who study the physical properties and behavior of chemical systems. They combine principles of physics and chemistry to understand how matter behaves on a molecular and atomic level. This interdisciplinary field involves the application of various techniques and theories from both disciplines to investigate chemical processes, reaction mechanisms, and the energy changes associated with chemical reactions.

The Poynting–Robertson effect is a phenomenon that describes the interaction between solar radiation and small particles in space, particularly dust and debris in the vicinity of the Sun. It is named after the physicists John Henry Poynting and Howard P. Robertson, who contributed to the understanding of this effect. When a small particle, such as dust, is illuminated by sunlight, it absorbs and re-emits that energy.