How does the Hubble Sphere limit our view of the Universe?
  It has recently been claimed that the Hubble Sphere represents a previously
unknown limit to our view of the universe, with light we detect today coming
from a proper distance less than this "Cosmic Horizon" at the present time. By
considering the paths of light rays in several cosmologies, we show that this
claim is not generally true. In particular, in cosmologies dominated by phantom
energy (with an equation of state of \omega < -1) the proper distance to the
Hubble Sphere decreases, and light rays can cross it more than once in both
directions; such behaviour further diminishes the claim that the Hubble Sphere
is a fundamental, but unrecognised, horizon in the universe.
