Coloured scanning electron micrograph (SEM) of a section through an arteriole (small blood vessel), showing crenated red blood cells inside. Crenation is caused by dehydration, which distorts the cell.
Victoria Crater, an impact crater at Meridiani Planum, near the equator of Mars. The crater is approximately 800 meters (half a mile) in diameter. Image: High Resolution Imaging Science Experiment (HiRISE) on Mars Reconnaissance Orbiter, NASA