Mass Flow & Its Effect: Explained

[edpell]

Ciufolini and Wheeler in their book "Gravitation and Inertia" talk about the effect of a flow of mass. Just as a flow of electric charge creates a magnetic field they say a flow of mass will create an effect. Can someone explain the nature of this effect to me? The author just fall back to saying it is like Maxwell's equation expect for gravity. A more explicit explanation would be appreciated. Thanks.

 

[nicksauce]

See: http://en.wikipedia.org/wiki/Gravitomagnetism