This means that fusion only occurs within a very hot gas.

The fusion occurs during the brief period while the material is rebounding.

The authors take this as evidence that fusion occurred in the earth shortly before the gas erupted.

A successful fusion in this respect occurs early in the ballet.

A substantial energy barrier of electrostatic forces must be overcome before fusion can occur.

Does this suggest that the sun's nuclear fusion could not occur at its centre (lack of pressure)?

During the period of pulse current, the weld area is heated and fusion occurs.

The fusion then occurs between the endplates of the vertebrae.

In extreme cases, whole vertebrae can be removed before the fusion occurs.

It finished when the Universe was about three minutes old and its temperature dropped below that at which nuclear fusion could occur.