Behold: the sunlit crescent of da Vinci glow caused by earthshine (light reflected from a bright planet Earth) on the moon. To wit:
..a description of earthshine in terms of sunlight reflected by Earth’s oceans illuminating the Moon’s dark surface was written over 500 years ago by Leonardo da Vinci. One lunar month ago [this] da Vinci glow was captured in stacked exposures from the Badain Jilin Desert of Inner Mongolia, China. This year marks the 500th anniversary of Leonardo da Vinci’s death.
Behold: two detailed views of Mimas, one of the major moons of Saturn. To wit:
Peering from the shadows, the Saturn-facing hemisphere of Mimas lies in near darkness alongside a dramatic sunlit crescent. The mosaic was captured near the Cassini spacecraft’s final close approach on January 30, 2017. Cassini’s camera was pointed in a nearly sunward direction only 45,000 kilometres from Mimas.
The result is one of the highest resolution views of the icy, crater-pocked, 400 kilometre diameter moon. An enhanced version better reveals the Saturn-facing hemisphere of the synchronously rotating moon lit by sunlight reflected from Saturn itself. Other Cassini images of Mimas include the small moon’s large and ominous Herschel Crater.
If you have a pair of those red-blue 3D specs, now’s the time to fish them out and float along beside Helene. To wit:
Appropriately named, Helene is one of four known Trojan moons, so called because it orbits at a Lagrange point. A Lagrange point is a gravitationally stable position near two massive bodies, in this case Saturn and larger moon Dione. In fact, irregularly shaped ( about 36 by 32 by 30 kilometers) Helene orbits at Dione’s leading Lagrange point while brotherly ice moon Polydeuces follows at Dione’s trailing Lagrange point. The sharp stereo anaglyph was constructed from two Cassini images captured during a close flyby in 2011. It shows part of the Saturn-facing hemisphere of Helene mottled with craters and gully-like features.