Images Dated 31st October 2003

Sojourner on the surface of Mars

Sojourner. Mars Pathfinder mosaic image of the robotic Sojourner vehicle on the surface of Mars near the rock known as "Barnacle Bill" (at centre left). "Barnacle Bill" was the first rock to be studied by Sojourner with its Alpha-Proton X-Ray Spectrometer (APXS). Sojourner also carries a high-resolution camera to study rocks. The rover weighs about 9 kilogrammes, is 63 centimetres (cm) long and 48cm wide. It is powered by a solar panel which will allow for a few hours movement per day, and is controlled by an operator on Earth. Image taken by the Imager for Mars Pathfinder (IMP) on the third Martian day (Sol 3) that it spent on Mars since it landed on 4 July 1997

© NASA/SCIENCE PHOTO LIBRARY

Computer graphic of deformity in a DNA molecule

Deformed DNA molecule. Computer-generated model of a segment of the molecule Deoxyribonucleic Acid (DNA), showing a deformity in its shape. DNA forms a natural double-helix shape. At upper centre (yellow/green) this form is unusually twisted. DNA is made up of two sugar-phosphate backbones (long ribbons) from which the nucleotide bases project inwards. It is the sequence of these bases that forms the genetic code. A mutation of one of the yellow nucleotides, or physical damage to the DNA (such as induced by ultraviolet light), may be the cause of this deformity. It may result in a genetic disorder which can have far reaching effects, including genetic disease

© MEHAU KULYK/SCIENCE PHOTO LIBRARY

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