The colour ratios of this multispectral image, taken by the Clementine probe, have been altered to cancel out the effects of brightness and topography, leaving the geological view. The crater Aristarchus is seen to have two distinct zones of ejecta: Mare lava from the Oceanus Procellarum to the south-east (bottom right), and upland material from the elevated plateau to the north-west. The continuous ejecta extends twice as far to the north and east, which may also have been an effect of the presence of the plateau.

Photo: NASA.

Inconstant Moon