  The recently discovered brown dwarf WISE 0855 presents our first opportunity
to directly study an object outside the Solar System that is nearly as cold as
our own gas giant planets. However the traditional methodology for
characterizing brown dwarfs---near infrared spectroscopy---is not currently
feasible as WISE 0855 is too cold and faint. To characterize this frozen
extrasolar world we obtained a 4.5-5.2 $\mu$m spectrum, the same bandpass long
used to study Jupiter's deep thermal emission. Our spectrum reveals the
presence of atmospheric water vapor and clouds, with an absorption profile that
is strikingly similar to Jupiter. The spectrum is high enough quality to allow
the investigation of dynamical and chemical processes that have long been
studied in Jupiter's atmosphere, but now on an extrasolar world.
