Images Dated 17th December 2003

Brachiosaurus dinosaur

Brachiosaurus dinosaur, artwork. Brachiosaurus was the tallest dinosaur, standing up to 16 metres tall. It could weigh up to 70 tons. Unusually for a dinosaur, its front legs were longer than its hind legs. It is thought that it fed on the high leaves of trees, as giraffes do today. Fossils of Brachiosaurus have been found in North America and Africa. It lived in the late Jurassic period, between 155 and 145 million years ago. It is thought that Brachiosaurus lived in herds, although a fully- grown adult would have had little to fear from predators. In the background, some pterosaurs, flying relatives of the dinosaurs, are seen

© JOE TUCCIARONE/SCIENCE PHOTO LIBRARY

the medieval Akershus Castle and Fortress. Over looking the harbor The castle

The medieval Akershus Castle and Fortress. Over looking the harbor The castle and fortress were built in 1300

© 2003 RUSSELL_YOUNG

Akershus Castle, Architecture, Castle, Culture, Danita Delimont, Europe, Fortress, Guard, Historical, History, Landmark, Medieval, Nordic, Norway, Oslo, Overlook, Royal, Russell Young, Scandinavia, Slottar, Steeple, Tower

Drying Mars in its past

Drying Mars. Image 3 of 4. Artwork of thin clouds and wet areas (dark) on Mars billions of years ago. It is thought that liquid water existed on Mars early in its history, but was lost to space over time. This may have been due to Mars weak gravity, thin atmosphere and weakening magnetic field. If liquid water did exist on Mars, there is a chance that life may have begun there. Numerous probes have so far failed to find any evidence for this, however. In the future, it may be possible to return Mars to a wet state artificially, and create an environment suitable for life once again. This process is called terraforming. For a sequence of Mars drying, see images R350/214-217

© JOE TUCCIARONE/SCIENCE PHOTO LIBRARY