How the Mariana Trench Became Earth's Deepest Point

Heavy lava, tectonic movements shaped the 7-mile-deep abyss.                                                                                                     James Cameron made headlines last month by successfully diving 6.8 miles (11 kilometers) to the deepest part of the Mariana Trench in a one-person submersible called the DEEPSEA CHALLENGER. 

MANY ARE INTERESTED IN KNOWING THE HISTORY OF GREAT WALL OF CHINA
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http://www.greatwall-of-china.com/51/great-wall-history-1.html

Dams Cutting Off 400 Million People From Food and Income

http://news.nationalgeographic.com/news/2010/06/100604-dams-economic-impact/

Cat's Paw Nebula

Stellar Relic

The final remnants of a sunlike star blown out in a blue, hazy disk of gas and dust is captured by the Hubble Space Telescope.

An Earth-size white dwarf is all that remains of the progenitor star inside this planetary nebula known as NGC 2452, in the southern constellation Puppis.

Astronomers estimate that approximately 5 billion years from now, the same fate awaits our sun.

Raindrop Dunes

An infrared view of dark sand dunes on the floor of one of the oldest craters on Mars was captured by NASA's Mars Reconnaissance Orbiter on October 2.

Such raindrop-shaped sand dunes are made of grains of a volcanic rock, basalt, and are among the most widespread wind-formed features on the red planet.

Lagoon Nebula

The colorful stellar nursery known as the Lagoon nebula is captured through a backyard telescope on August 1.

Located some 5,000 light-years from Earth in the southern constellation Sagittarius, this giant cloud of gas and dust stretches some 100 light-years across and is faintly visible with the naked eye from dark locations.