This talk will provide a general introduction to the space of null
geodesics. I will begin with a discussion of the case of Minkowski
space, a special case with a great deal of structure. After this, I will
move on to the more general case of the space of null geodesics of
space-time, modelled as a Lorentz manifold, beginning with the
fundamental topological and differentiable structure. With this in
place, we can introduce additional structure, and I will describe (some
of) the interplay between the geometrical and causal structure of the
original space-time and its space of null geodesics.
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