Mars

Organic molecules inside space rock were probably the result of plain old chemistry

Devoting all the funding to just one mission would be a mistake

Extended missions to the moon or Mars mean that astronauts may need improved medical care and even the ability to perform surgery in space

New pix throw cold water on reports of recently flowing streams

Will the sun destroy Earth? Astronomers come closer to an answer.

A reinterpretation of old Mars lander data leads a researcher to conclude that the tests actually may have found life signs. Steve Mirsky reports.

Mars and Its Canals. By Percival Lowell. Illustrated. The Macmillan Company. New York and London, 1907. Octavo. Pp. 393.

New studies of two exoplanets find that one keeps its hot side excruciatingly hot and the other may be stirred by 5,000 mph winds

Startling fossil discoveries in the Chilean Andes reveal an unexpected menagerie of unique mammals that once roamed South America. The finds also overturn long-held wisdom about the continent's geologic history

It might mean life, it might mean unusual geologic activity; whichever it is, the presence of methane in the atmospheres of Mars and Titan is one of the most tantalizing puzzles in our solar system

Not too hot and not too cold means just right for water

Data entry mistake ultimately caused the craft to run out of power