The conservation of angular momentum is a principle in physics stating that if no external torque acts on a system, its total angular momentum remains constant. Angular momentum depends on the object's mass, shape, and rotation speed. This principle helps explain various phenomena, such as why a spinning figure skater can spin faster by pulling in their arms. In space, the conservation of angular momentum is crucial for understanding the motion of celestial bodies like planets and stars. For example, as a star collapses, it spins faster due to the conservation of angular momentum, leading to the formation of neutron stars or black holes.