An artist's conception shows Voyager 1 encountering a stagnation region. To the left is interstellar space. NASA/JPL-Caltech hide caption

itoggle caption NASA/JPL-Caltech

A NASA illustration comparing the newly discovered planets to Venus and Earth. Kepler-20e is slightly smaller than both Venus and Earth. Kepler-20f is slightly larger. NASA/Ames/JPL-Caltech hide caption

itoggle caption NASA/Ames/JPL-Caltech

Artist's concept of NASA's Voyager spacecraft. For 35 years, the probes have been beaming images and information back to Earth via a 23-watt transmitter. NASA/JPL-Caltech hide caption

itoggle caption NASA/JPL-Caltech

SETI says that its Allen Telescope Array will be back online in September, thanks to funding secured from online donations. The array is seen here, adjacent to a cow pasture in Hat Creek, Calif. Ben Margot/AP hide caption

itoggle caption Ben Margot/AP

Food packets containing the astronauts' "all-American meal," including (clockwise from top left) corn, chicken, brisket, and beans, along with a lemonade, at right. Devin Boldt/NASA - JSC hide caption

itoggle caption Devin Boldt/NASA - JSC

Astronaut Steve Bowen works outside the International Space Station's Quest airlock during Monday's spacewalk. Bowen's spacewalk was unexpectedly extended by a computer malfunction. NASA TV hide caption

itoggle caption NASA TV