Sky and Telescope - July 2018 - 14
RED PLANET RESOLUTION
by Bruce Jakosky
M ars 's
atm o s p h e re
FLOOD LINES Scientists think
that catastrophic ﬂooding carved
Osuga Valles, the central portion of
which is shown here. The ﬂoor has
been grooved by fast-ﬂowing water. In some places, Osuga Valles
plunges 900 m (3,000 ft) deep.
It sits at the eastern edge of the
Valles Marineris canyon system.
J U LY 2 0 1 8 * S K Y & T E L E S C O P E