Michael Ferrara with his German shepherd, Lhotse, at the top of Colorado's Independence Pass Paolo Marchesi/Outside hide caption

itoggle caption Paolo Marchesi/Outside

Fear The Prius? A Toyota Prius hybrid model car waits for customers at a Toyota dealer in Hollywood, Calif., on March 10. Concerns about the cars suddenly accelerating dogged the company earlier this year. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

In the 15 years since its December 1995 launch, the SOHO spacecraft has doubled the number of comets sighted in the previous 300 years. Alex Lutkus/NASA/ESA hide caption

itoggle caption Alex Lutkus/NASA/ESA

The inner four planets of the Gliese 581 system orbit the host star, a red dwarf 20 light-years from Earth, in this rendering from a National Science Foundation artist. The planet in the foreground has a 37-day orbit and, like Earth, is far enough from the star for liquid water to exist. Lynette Cook/via NASA hide caption

itoggle caption Lynette Cook/via NASA

One of the goals of the ATLAS detector at the Large Hadron Collider is to search for the Higgs boson, a particle that scientists say gives everything in the universe mass. For scale, note the workers toward the bottom of the image. Maximilien Brice/CERN hide caption

itoggle caption Maximilien Brice/CERN