In outer space, where there is no atmospheric drag or any significant gravitational fields to slow down an object, the only limiting factor to an object's speed is the ultimate speed limit of the universe, the speed of light. However, it's important to note that reaching and surpassing the speed of light is not possible within the framework of our current understanding of physics.

Light moves at a constant velocity of approximately 299,792,458 meters per second (186,282 miles per second). This value is known as the "speed of light."

According to the theory of relativity, an object with mass would require an infinite amount of energy to reach the speed of light, and even if it could theoretically attain that speed, it would experience infinite time dilation and an infinite increase in mass, making it impossible to move further.

In essence, the laws of physics, as we currently understand them, set the speed limit for any object in the universe to the finite value of the speed of light. Therefore, the speed of light acts as the ultimate cosmic barrier that limits the speed of any object, whether in outer space or otherwise.