Valles Marineris, Giant Canyon on Mars - Valles Marineris, the grand valley of Mars, extends over 1,800 miles (3,000 kilometers) long, spans as much as 370 miles (600 kilometers) across, and plunges as much as 5 miles (8 kilometers) deep.
Is it Snowing Microbes on Enceladus? There's a tiny moon orbiting beyond Saturn's rings that's full of promise, and maybe -- just maybe -- microbes. In a series of tantalizingly close flybys to the moon, named "Enceladus," NASA's Cassini spacecraft has revealed watery jets erupting from what may be a vast underground sea. These jets, which spew through cracks in the moon's icy shell, could lead back to a habitable zone that is uniquely accessible in all the solar system.
Heracleion was an ancient Egyptian city near Alexandria whose ruins are located in Abu Qir Bay. It was known as early as the 12th century BC but its importance grew during the waning days of the Pharaohs, the late period, when it was Egypt's main port.