. >> mark duckerburg cashing in facebook stock to pay his taxes, he says, selling more than 41 million shares. that comes out to about $2.3 billion and pact change for zuckerberg. facebook saying it expects him to use the money to satisfactory tax requirements from another stock sale. >> imagine mapping out space, the final frontier. that is the mission for the most powerful telescope in the world that was launched this morning from french guiuan in a. scientists plan to park the telescope in its shadow, about 1.5 million kilometers away. from here without the sun's glare, it will be able to survey surrounding stars. >> we don't know however away many stars are, we know the nearby ones. it will refine positions to in many cases, the 1% or better, so for the first time, we'll have an accurate 3-d map of a large chunk of the galaxy. >> it uses two identical telescopes to track the movement of distant stars. each has five mirrors focusing the light on to effectively what is a camera the most powerful ever put in space. this technique will pinpoint the position of 2 million stars an hour,