For small particles of dust, this phenomenon overwhelms the Poynting-Robertson drag, causing them to blow (*) out of the solar system.
It's not gravity, but a torsion balance was used to measure this phenomenon by Nichols and Hall. A differential of this phenomenon across the dawn and dusk lines of an asteroid is responsible for the Yarkovsky effect. For small particles of dust, this phenomenon overwhelms the Poynting-Robertson drag, causing them to blow (*) out of the solar system. It is equal to the time average of the Poynting vector divided by the speed of light. Its strength is equal to one third times the energy density, or one third times the fourth power of the temperature times an expression involving the Stefan-Boltzmann constant. Its strength is proportional to the reflectance of the body and can be derived from the fact that photons have momentum. For 10 points, name this phenomenon which is the basis of the solar sail, which occurs when electromagnetic waves exert a force on an object.
It's not gravity, but a torsion balance was used to measure this phenomenon by Nichols and Hall.
radiation pressure