This diagram for the outer solar system shows the orbits of Sedna (in orange) and 2012 VP113 (in red). The sun and terrestrial planets are at the center, surrounded by the orbits (in purple) of the four giant planets — Jupiter, Saturn, Uranus and Neptune. The Kuiper belt, which includes Pluto, is shown by the dotted light blue region. Scott S. Sheppard/Carnegie Institution for Science hide caption

itoggle caption Scott S. Sheppard/Carnegie Institution for Science

Early days: NASA's International Sun-Earth Explorer C (also known as ISEE-3 and ICE) was undergoing testing and evaluation inside the Goddard Space Flight Center's dynamic test chamber when this photo was snapped in 1976. NASA hide caption

itoggle caption NASA

The Hadean zircons --€ the” oldest bits of Earth yet found --€” were discovered near here, on a sheep ranch in Jack Hills, Western Australia. Courtesy of University of Wisconsin hide caption

itoggle caption Courtesy of University of Wisconsin

Climbing robots, modeled after termites, can be programmed to work together to build tailor-made structures. [Image courtesy of Eliza Grinnell, Harvard School of Engineering and Applied Sciences hide caption

itoggle caption [Image courtesy of Eliza Grinnell, Harvard School of Engineering and Applied Sciences

Graduate student Jennifer Klunk of McMaster University examines a tooth used to decode the genome of the ancient plague. Courtesy of McMaster University hide caption

itoggle caption Courtesy of McMaster University

The eastern Grand Canyon was about half-carved (to the level of the red cliffs above the hiker) from 15 million to 25 million years ago, an analysis published Sunday suggests. But the inner gorge was likely scooped out by the Colorado River in just the past 6 million years. Laura Crossey/University of New Mexico hide caption

itoggle caption Laura Crossey/University of New Mexico

Computer networks and GPS systems are only possible because of the precision timekeeping of atomic clocks like the one above, says clockmaker and physicist Jun Ye. Ye Group and Baxley/JILA hide caption

itoggle caption Ye Group and Baxley/JILA

Kepler-22b, seen in this artist's rendering, is a planet a bit larger than Earth that orbits in the habitable zone of its star. Some researchers think there might be "superhabitable" worlds that may not resemble Earth. NASA/Ames/JPL-Caltech hide caption

itoggle caption NASA/Ames/JPL-Caltech

A reproduction of the mural from a room in Catalhoyuk, a Neolithic settlement in Turkey. Sarah Murray/Flickr hide caption

itoggle caption Sarah Murray/Flickr

Vera Wojtesta was one of 300 babies flagged by New York's newborn screening program as at risk of having life-threatening Krabbe disease. Ben Shutts/Courtesy of the Wojtesta family hide caption

itoggle caption Ben Shutts/Courtesy of the Wojtesta family