  The Russell Conjecture states that there is an unproven possibility of small
(<1 m) hollow heat-resistant objects (HoHOs) in Earth orbit or otherwise
present in the inner solar system or asteroid belt. While such objects are not
the current target of any ongoing searches, we can place stringent limits on
their presence using current optical and infrared surveys. The high albedo of
HoHOs partially compensates for their small size. As such, we find that no
HoHOs greater than 10 cm in radius to a distance of at least 30,000 km, by the
Air Force Space Surveillance System. Objects of that size in a stable orbit at
384,000 km (the Earth-Moon distance) may be detected and confirmed by more
infrequent, deeper sweeps of the same system. However, it remains possible for
undetected HoHOs to exist in near-Earth or Martian orbit. We discuss the
prospects of finding such HoHOs in the near future with new telescopes such as
LSST.
