SOLAR SYSTEM

Detailed explanation-1: -Because of conservation of angular momentum, the cloud spins faster as it contracts.

Detailed explanation-2: -Gravity causes the cloud to contract, or get smaller. The cloud spins as it contracts. The cloud becomes more compact and spins faster.

Detailed explanation-3: -Gravity causes the cloud to begin falling together, but it does not do so uniformly. The collapsing cloud begins to break up into denser regions (shown in yellow).

Detailed explanation-4: -As the globule collapses, the temperature and pressure increase and it spins faster. Material in the central core of the cloud is squeezed so tightly that it becomes hot enough to ignite nuclear fusion.

Detailed explanation-5: -This same effect is seen in space, although it is a bit more complex. As a star forming cloud begins to contract, the rotation rate must increase, because angular momentum is conserved. In general, a big, slowly rotating system will turn into a small, rapidly rotating system. The collapse amplifies the rotation rate.