While studying at Stanford with John Breakwell, a legendary aeronautical engineer, Farquhar started working out the dynamics
of libration points and «halo»
orbits — three -
dimensional loops around the points — so named because from
Earth the
orbit would look like a halo around the libration point.
In other words, in a special three -
dimensional coordinate system (a, e, and i), each
of a thousand scattered points represented an asteroid starting out on a different
orbit from some point on
Earth's
orbit.