Near Mars' equinoxes, the moons of Mars pass between the Sun and the planet, drawing a line of penumbral eclipses across the surface. Here, Phobos' penumbra passes across Mount Sharp, to the south of Curiosity, on sol 1694 (May 12, 2017). Two different Navcam images show the difference between the ordinary-lit mountain and the view when it's in Phobos' shadow.
Curiosity captured three images of Earth setting in the western sky after sunset on sol 529 with its higher-resolution Mastcam-100. Here, the images have been subtracted to cancel out noise in the camera detector, revealing Earth's bright dot in motion.
Opportunity gazed skyward to capture this view of drifting clouds on sol 1,433 (February 4, 2008). The four images in this animation were taken about 30 seconds apart, and have all been flat-fielded to remove the effects of the dust that now covers Opportunity's camera windows.