Black Body Radiation and Kinetic Energy

[Ontophobe]

I see that black body radiation slowly depletes a body's thermal energy, which is just another way of saying that black body radiation depletes the kinetic energy of a body's constituent particles. But does black body radiation also cut into the kinetic energy of the body as a whole, such that a chunk of rock in space moving at uniform velocity is actually technically slowly decelerating?

 

[Bystander]

No.