IMAGE_pic1\200_299\227.GIF,The Hubble Space Telescope sent back this picture of Mars, showing in dark blue the region known as Syrtis Major.
IMAGE_pic1\200_299\203.GIF,This Viking photograph was taken as the probe neared Mars. It shows near the centre Mariner Valley; to the left clouds near a volcano, and to the right a frost-filled Argyre Basin.
IMAGE_pic1\200_299\231.GIF,A Viking approach photograph showing at centre the three huge volcanoes on the Tharsis Ridge. To their left is the biggest volcano of all, mighty Olympus Mons.
IMAGE_pic1\100_199\138.GIF,In 1976 a Viking orbiter spots a swirling dust storm (arrowed) travelling across the surface of Mars.
IMAGE_pic1\200_299\202.GIF,This great gash in the surface of Mars, near the equator, is Mariner Valley (Valles Marineris).
IMAGE_pic1\200_299\232.GIF,Clouds gather on the slopes of the biggest volcano in the Solar System, Olympus Mons on Mars, five times the height of Everest and 600 km across at the base. This painting is based on Viking photographs.
IMAGE_pic1\0_99\94.GIF,A false colour picture of Mars' giant volcano Olympus Mons, obtained by computer processing data from the Viking orbiters.
IMAGE_pic1\100_199\146.GIF,A Viking orbiter picture of the Martian surface. It is pockmarked with craters and criss-crossed with channels, some made by lava flows but others maybe by flowing water.
IMAGE_pic1\100_199\199.GIF,This Viking picture of the Martian surface shows what appears to be a watercourse, formed aeons ago by flooding.
IMAGE_pic1\200_299\200.GIF,The Viking 1 orbiter snapped this picture of a "face" etched in the Martian landscape. Some have suggested that intelligent beings carved it.
IMAGE_pic1\100_199\184.GIF,The tiny Martian moon Phobos, from photographs taken by the Viking probes. It is probably a captured asteroid.
IMAGE_pic1\200_299\229.GIF,The smaller of Mars' two moons, Deimos, pictured by Viking.
IMAGE_pic1\100_199\143.GIF,The rust-coloured Martian surface on the plain of Chryse, photographed by the Viking 1 lander in 1976.
IMAGE_pic1\200_299\201.GIF,Part of the Viking 1 lander can be seen in this close-up picture of the Chryse plain of Mars. The tool on the right is the digging arm used to pick up soil samples.
IMAGE_pic1\200_299\274.GIF,Steep cliffs circle the summit crater of Mars' huge volcano, Olympus Mons, which is some 65 km across. This model is based on Viking photos.
IMAGE_pic1\500_599\504.GIF,Kicking up the Martian dust, an automatic Mars explorer descends to the surface. Later it will deploy a rover to collect samples from various sites, which it will then return to Earth.
