Unusual Hollows Discovered on Planet Mercury From the NASA Astronomy Picture of the Day web site

Spiral Galaxies in Collision	Seyfert's Sextet	Mercury in Accentuated Color	Colors of Mercury	A Double Ringed Basin on Mercury	Unusual Hollows Discovered on Planet Mercury
MESSENGER's First Day	Mercury's Surface in Exaggerated Color	Venus' Once Molten Surface	Venus Unveiled	Mysterious Acid Haze on Venus	Venus: Just Passing By