  The purpose of this paper is to re-open from a practical perspective the
question of the extent in altitude of the Earth's biosphere. We make a number
of different suggestions for how searches for biological material could be
conducted in the mesosphere and lower thermosphere, colloquially referred to as
the ignoreosphere due to its lack of investigation in the meteorological
community compared to other regions. Relatively recent technological advances
such as CubeSats in Very Low Earth Orbit or more standard approaches such as
the rocket borne MAGIC meteoric smoke particle sampler, are shown as
potentially viable for sampling biological material in the ignoreosphere. The
issue of contamination is discussed and a potential solution to the problem is
proposed by the means of a new detector design which filters for particles
based on their size and relative-velocity to the detector.
