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NASA's Cassini spacecraft obtained these views of the south polar area of Saturn's moon Enceladus in visible and near-visible (ultraviolet and infrared) light and synthetic-aperture radar (SAR).

Unmanned aerial vehicles, like this Predator (shown here in 2009 during training at Creech Air Force Base in Indian Springs, Nev.), make up the fastest growing segment of the U.S. Air Force.

The Minister for Broadband, Communications and the Digital Economy, Senator Stephen Conroy, today launched new National Broadband Network (NBN) operation and demonstration facilities in Melbourne.

胡宜珍/內湖館/
http://mail.google.com/mail/u/0/h/dbylka5yws1k/?&v=c&s=l&l=e-news&th=133...
http://www.minister.dbcde.gov.au/media/media_releases/2011/292

Professor Anna Stefanopoulou (left) examines a V8 internal combustion engine with students Jacob Larimore and Xinfan Lin at the University of Michigan's Automotive Research Center. The researchers model engine performance to improve efficiency.

The west coast of Ireland boasts one of the largest concentrations of wave energy in the world, and consequently, Ireland has been pursuing the development of wave energy as a sustainable/renewable energy alternative. Wave energy conversion devices, such as the ones pictured here, are being developed and tested by a number of companies. [Photo courtesy Ocean Energy, Ltd.]

Europa's "Great Lake." Researchers predict many more such lakes are scattered throughout the moon's icy shell.

Preparing in Florida for Launch to Mars
The Mars Science Laboratory Spacecraft, inside its payload fairing, is hoisted onto its Atlas V launch vehicle (left). The mission will place a rover onto the surface of Mars in August 2012.

Scientists are simulating how the very first stars in our universe were born. This diagram shows a still from one such simulation. The cube on the right is a blown up region at the center of the box on the left.

This radar image of asteroid 2005 YU55 was obtained on Nov. 7, 2011, at 11:45 a.m. PST (2:45 p.m. EST/1945 UTC), when the space rock was at 3.6 lunar distances, which is about 860,000 miles, or 1.38 million kilometers, from Earth.

Scientists have found bones in Brazil that belonged to a 20-foot-tall sloth that lived some 10,000 years ago.