In the distant future, humanity has encountered, made peace and wars with countless advanced civilizations, but one civilization that still baffles them, is the race of intelligent centipedes.
The centipedes possesses multiple appendages for holding items, utilities, and tools, while the others are used for walking and other purposes. The centipedes' top shell seems to be mushy to the touch and is said to be shed off at the later stages of their life.
Other than having a striking similarity to centipedes, the species are known to eat both plants and animals and, each member of their race seems to vary in physique, much like humans.
What would cause centipedes to evolve and become a space faring race?