Disparate perceptions and conceptual frameworks of environment and the relationship between humans and nature often lead to confusion, constraints on co-operation and collaboration and even conflict w
The theory, observations, and applications ofgravitational lensingconstitute one ofthe most rapidly growing branches ofextragalactic astrophysics. The deflection of light from very distant sources by
Light observed from distant objects is found to be deflected by the gravitational field of massive objects near the line of sight - an effect predicted by Einstein in his first paper setting forth the
