crater

Unnamed beauty

This striking perspective view from ESA’s Mars Express shows an unnamed but eye-catching impact crater on Mars. This region sits south-west of a dark plain named Mare Serpentis (literally ‘the sea of serpents’), which in…


The history of an impact crater

The shape of a crater can depend on factors including the angle of impact and the pre-impact slope and topography. This image shows a roughly 3-kilometer impact crater, formed on the sloping walls of Tithonium…


Dark Mercury

Mercury’s surface is unusually dark, an observation that until recently had planetary scientists mystified. But in a new study published today in Nature Geoscience, a team of researchers provides evidence that the darkening agent is…


A heartfelt (late) valentine

The Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) team sends St. Valentine’s Day greetings from Mars! This image of a heart-shaped mesa with a crater at the center was taken by the CTX camera on…


A cool crater with salt stripes?

Features on dwarf planet Ceres that piqued the interest of scientists throughout 2015 stand out in exquisite detail in the latest images from NASA’s Dawn spacecraft, which recently reached its lowest-ever altitude at Ceres. Dawn…


A complex crater

The central portion of this image is dominated by a sharp-rimmed crater that is roughly 5 kilometers in diameter. On its slopes, gullies show young (i.e., geologically recent) headward erosion, which is the lengthening of…


Fresh Old Crater on Mars

This impact crater appears relatively recent as it has a sharp rim and well-preserved ejecta. The steep inner slopes are carved by gullies and include possible recurring slope lineae on the equator-facing slopes. Fresh craters…