In intergalactic space, the maximum speed at which an object can be hurled through natural processes is limited by the speed of light, which is approximately 299,792,458 meters per second (or about 186,282 miles per second). According to our current understanding of physics, nothing can travel faster than the speed of light in a vacuum.
This limitation is described by Einstein's theory of relativity, which states that as an object with mass approaches the speed of light, its energy and momentum increase without bound. In order to accelerate an object with mass to the speed of light, an infinite amount of energy would be required, which is not feasible with known natural processes.
While there are natural processes, such as astrophysical events like supernovae or gravitational interactions with massive objects, that can impart significant velocities to objects in space, they are still limited by the ultimate speed limit of light. Thus, any object, regardless of its mass, would be unable to exceed the speed of light through natural means in intergalactic space.