Here's why:

* Different starting points: Objects in space begin their journeys with different initial velocities. For example, a spacecraft launched from Earth will have a different initial velocity than a comet orbiting the sun.

* Gravity: The gravitational pull of celestial bodies like stars and planets affects the speed of objects in space. A planet orbiting a star will be moving faster than a comet that only passes by.

* Collisions and interactions: Objects in space can collide with each other, altering their speeds and directions.

* Rocket propulsion: Spacecraft can use their engines to change their speed and direction.

The misconception about objects traveling at the same speed in space might arise from:

* The concept of freefall: In the absence of air resistance, objects in a vacuum will fall at the same rate. This doesn't mean they will have the same speed, just that they will accelerate at the same rate.

* The vastness of space: The distances between objects in space are enormous, giving the impression that things are moving slowly. This is relative to our experience on Earth, where we're constantly surrounded by objects and motion.

In summary, the speed of objects in space is determined by a complex interplay of forces and initial conditions. It's not a uniform speed, and objects can travel at a wide range of velocities.