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The European Space Agency's (ESA) first mission to Mars, called Mars Express, was launched June 2, 2003 and entered an orbit around the planet by December 25. This Image Gallery exhibits a number of images of Mars captured by the High Resolution…

Spanish histologist, Santiago Ramón y Cajal (1852-1934), is credited with establishing modern neuroscience in the early 20th century. Some of Cajal's earliest illustrations of the structures of the nervous system are reproduced in this gallery along…

Glaciers in cold mountain regions are key indicators of global climate change. This Image Gallery exhibits glaciers, their behavior, and influence on the surrounding environment. View mountain glaciers dramatically shaping our landscapes around the…

Otto Lilienthal and Octave Chanute were the pioneers of flight who most influenced and inspired Orville and Wilbur Wright. Photographs of Lilienthal, a German engineer, depict his flying attempts in various gliders before his career was cut short in…

A supernova is the explosive death of a star. This Image Gallery exhibit shows optical, x-ray, and radio images of five famous supernova remnants of varying ages, from the extremely young (SN 1987A, at just over 15 years old) to the very old (Vela…

In 2006, evolutionary biologists at the American Museum of Natural History conducted a phylogenetic analysis of spiny-rayed teleost fishes. They discovered that at least a thousand more venomous fish species inhabit worldwide aqautic ecosystems—a…

Wilbur Wright asks for help from the respected engineer, Octave Chanute, in May of 1900. View all five pages of this original handwritten letter, which provides remarkable insight into the approach the Wright Brothers were planning to take in…