The concept of the graviton, a hypothetical particle that mediates the force of gravity, is primarily used within the framework of quantum field theory to describe gravitational interactions on a subatomic scale. However, it is important to note that the graviton has not been directly observed or confirmed experimentally. Therefore, its properties, including its mass, remain speculative.
In theoretical frameworks such as superstring theory and certain approaches to quantum gravity, gravitons are treated as massless particles, similar to photons, the particles of light. This means that they would travel at the speed of light and have zero rest mass. However, it is also worth mentioning that the nature and behavior of gravitons are still subjects of ongoing research and scientific debate.
It is important to stay updated with the latest developments in the field of theoretical physics and the study of gravity, as our understanding may evolve over time.