article_snippet.sent: The distance from the sun is given in AU, which stands for Astronomical Unit - and one AU is the distance from Earth to the sun .
article_snippet.sent: Nasa followed claims by Dr Ellen Stofan, chief scientist for Nasa, that we could find life in the next ten or 20 years.
article_snippet.sent: In us lifetime, us may very well finally answer whether us are alone in the solar system and beyond.
article_snippet.sent: at least 200 billion Earth-like planets in our galaxy - and now Nasa officials claim us could be on the verge of finding life on one of Nasa officials.
article_snippet.sent: During a talk in Washington this week, Nasa announced that humanity is likely to encounter extra-terrestrials within a decade. '
article_snippet.sent: I believe we are going to have strong indications of life beyond Earth in the next decade and definitive evidence in the next 10 to 20 years,' said Dr Stofan. '
article_snippet.sent: Dr Jeffrey Newmark, interim director of heliophysics at Nasa, added: 'It's definitely not an if, it's a when.' '
article_snippet.sent: but as we don’t know of any yet
article_snippet.sent: And Nasa’s next great space observatory meanwhile, the James Webb Space Telescope, scheduled to launch in 2019, will examine the atmospheres of certain worlds in detail.
article_snippet.sent: next great space observatory said in a statement.