IMAGE 0_99\75.Lbm,A full-scale model of the Viking lander that set down on Mars in 1976. In the foreground is the extendable sampling arm.
IMAGE 200_299\203.Lbm,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 200_299\231.Lbm,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 100_199\146.Lbm,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 100_199\199.Lbm,This Viking picture of the Martian surface shows what appears to be a watercourse, formed aeons ago by flooding.
IMAGE 0_99\94.Lbm,A false colour picture of Mars's giant volcano Olympus Mons, obtained by computer processing data from the Viking orbiters.
IMAGE 100_199\138.Lbm,In 1976 a Viking orbiter spots a swirling dust storm (arrowed) travelling across the surface of Mars.
IMAGE 200_299\202.Lbm,This great gash in the surface of Mars, near the equator, is Mariner Valley (Valles Marineris).
IMAGE 200_299\232.Lbm,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 700_799\725.Lbm,In this Viking orbiter picture of Mars, mist hangs in the canyons of the region known as the Labyrinth of the Night.
IMAGE 200_299\272.Lbm,The Viking 2 lander's cameras snapped this picture of the Martian surface on the plain of Utopia, showing pockets of frost.
IMAGE 1700_99\741.Lbm,Viking 2 view of the Martian plain of Utopia, remarkably similar to the Viking 1 view.
IMAGE 200_299\274.Lbm,Steep cliffs circle the summit crater of Mar's huge volcano, Olympus Mons, which is some 65 km across. This model is based on Viking photos.
IMAGE 100_199\184.Lbm,The tiny Martian moon Phobos, from photographs taken by the Viking probes. It is probably a captured asteroid.
IMAGE 200_299\229.Lbm,The smaller of Mars's two moons, Deimos, pictured by Viking.
