This frame from an animation shows five versions of observations that NASA's Curiosity made about one hour apart while Mercury was passing in front of the sun on June 3, 2014. Two sunspots, each about the diameter of Earth, also appear.
After passing on the darkside of the planet, NASA's Mariner 10 photographed the other, somewhat more illuminated hemisphere of Mercury. The north pole is at the top, two-thirds down from which is the equator.
This computer generated photomosaic from NASA's Mariner 10 is of the southern half of Mercury's Shakespeare Quadrangle, named for the ancient Shakespeare crater located on the upper edge to the left of center.
This picture, taken only minutes after NASA's Mariner 10 made its closest approach to Mercury, is one of the highest resolution pictures obtained. Abundant craters in various stages of degradation dot the surface.
A scarp, or cliff, extends diagonally from upper left to lower right in this picture of Mercury taken by NASA's Mariner 10. The structures are believed to be formed by the compressive forces due to crustal shortening.
This double ring basin (top center of image) was photographed during NASA's Mariner 10's second encounter and shows two craters about 30 km in diameter which have been engulfed by smooth plains on the floor of the inner ring.
This image, from NASA's Mariner 10 spacecraft which launched in 1974, shows intercrater plains and heavily cratered terrain typical of much of Mercury outside the area affected by the formation of the Caloris basin.
As NASA's Mariner 10 passed by Mercury on its second encounter with the planet on Sept. 21, 1974, this picture of a large circular (350 kilometer, 220 mile diameter) basin was obtained near the morning terminator.
A cratered area near Mercury's South Pole was photographed by NASA's Mariner 10 during its second flyby of the planet of Sept. 21, 1974 (the spacecraft made its first encounter with Mercury on March 19, 1974).
Taken about 40 minutes before NASA's Mariner 10 made its close approach to Mercury on Sept. 21,1974, this picture shows a large double-ringed basin (center of picture) located in the planet's south polar region
NASA's Mariner 10 photo reveals a heavily cratered terrain on Mercury with a prominent scrap extending several hundred kilometers across the upper left. A crater, nested in a larger crater, is at top center.
This image, from NASA's Mariner 10 spacecraft which launched in 1974, is of the H-7 Beethoven Quadrangle, and lies in Mercury's Equatorial Mercator. NASA's Mariner 10 spacecraft imaged the region during its initial flyby of the planet.
Mercury: Photomosaic of the Michelangelo Quadrangle H-12
This image, from NASA's Mariner 10 spacecraft which launched in 1974, is of the Michelangelo Quadrangle, which lies in Mercury's southern polar region. The Mercurian surface is heavily marred by numerous impact craters.
The Kuiper Quadrangle was named in memory of Dr. Gerard Kuiper, an imaging team member, and well-known astronomer, of NASA's Mariner 10 Venus/Mercury. The Kuiper crater is seen left of center in this image.