The rotation rate increases and results in a disk of material around a protostar.

Galaxies, earth rotation,

C2H4Cl2 (dichloroethane) has tetrahedral geometry around both carbon atoms. The geometry can be changed from free rotation to restricted rotation which has the formula of C2H2Cl2.

Gary J. Melnick has written:

'Observations of the rotational transitions of OH from the Orion molecular cloud' -- subject(s): Molecular rotation, Observations

Thomas M Dame has written:

'Molecular clouds and galactic spiral structure' -- subject(s): Molecular rotation, Interstellar matter, Carbon monoxide