LaTeX2e help 1.6
\hspace command adds horizontal space. The length of the
space can be expressed in any terms that LaTeX understands, i.e.,
points, inches, etc. You can add negative as well as positive space
\hspace command. Adding negative space is like
LaTeX removes horizontal space that comes at the end of a line. If you
don't want LaTeX to remove this space, include the optional
argument. Then the space is never removed.