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

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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

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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

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

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"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

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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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