This artist's concept puts solar system distances -- and the travels of NASA's Voyager 2 spacecraft -- in perspective. The inner edge of the main part of the Oort Cloud could be as close as 1,000 AU from our Sun. The outer edge is estimated to be around 100,000 AU. It will take about 300 years for Voyager 2 to reach the inner edge of the Oort Cloud and possibly about 30,000 years to fly beyond it. Image credit: NASA.