Theoretical Physicist Sean Carroll asks why does time exist? Marla Aufmuth/Courtesy of TED hide caption

itoggle caption Marla Aufmuth/Courtesy of TED

"Human beings are works in progress that mistakenly think they're finished," says psychologist Dan Gilbert. Ryan Lash/Courtesy of TED hide caption

itoggle caption Ryan Lash/Courtesy of TED

An artist's conception of how Saturn's immense Phoebe ring might appear to eyes sensitive to infrared wavelengths. NASA/JPL/Space Science Institute hide caption

itoggle caption NASA/JPL/Space Science Institute

The new spacecraft, called LightSail, is orbiting Earth. Future versions could travel to the moon and beyond. The Planetary Society hide caption

itoggle caption The Planetary Society

The Two-Way

Solar Sail Unfurls In Space

A nonprofit has successfully tested technology that could one day be used to explore the solar system on a budget.

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Artist Honor Harger says Jupiter sounds like "ocean waves breaking up on the beach." Robert Leslie/Courtesy of TED hide caption

itoggle caption Robert Leslie/Courtesy of TED

TED Radio Hour

Honor Harger: What Does Space Sound Like?

Sound artist Honor Harger spent the last few years listening to the stars and recording some of the sounds of space.

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A Proton-M rocket shown in 2013. The same type of rocket malfunctioned in mid-flight on Saturday and crashed over Siberia carrying a Mexican communications satellite. PHOTO ITAR-TASS/ITAR-TASS/Landov hide caption

itoggle caption PHOTO ITAR-TASS/ITAR-TASS/Landov