No one knows how many planets there are outside of our own solar system. So far, there have been 160 'extrasolar' planets discovered. In a galaxy with over 500,000 million stars, it is more than likely that manymore will be discovered. But there remains the problem that these planets have never been seen by human eyes. Only an artist, with scientific backing, could visualise these far away worlds - Lynette Cook has been creating space art for the past decade, visualising what telescopes cannot see.