The Orbiting Carbon Observatory-2 will monitor carbon dioxide emissions. jhoward/NASA/JPL hide caption

itoggle caption jhoward/NASA/JPL

The Cassini spacecraft has been taking radar images of Titan for years now. This modified image of the Ligeia Mare, a sea on Titan's north pole, is a composite of some of those. NASA/JPL-Caltech/ASI/Cornell hide caption

itoggle caption NASA/JPL-Caltech/ASI/Cornell

Artist concept of New Horizons spacecraft. The Hubble Space Telescope is being pressed into service to help scientists look for a post-Pluto target for the space probe. Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute hide caption

itoggle caption Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

The remote HAARP facility in Alaska has 180 antennas that are used to study the ionosphere. Courtesy of Christopher Fallen hide caption

itoggle caption Courtesy of Christopher Fallen

"When the rocket stops, you will be in space, there will be complete silence, you will unbuckle, you will float around" — Richard Branson Robert Leslie/TED hide caption

itoggle caption Robert Leslie/TED

TED Radio Hour

Richard Branson: Is Space Tourism Finally About To Take Off?

Entrepreneur Richard Branson shares his vision for private, commercial space travel.

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