astroengine writes: "Astronomers believe they have found a second distant planet around Fomalhaut, a bright young neighbor star, and that the far-out world — like its sister planet — is shepherding and shaping the star's ring of dust. If confirmed, theorists have some work to do explaining how the planet, believed to be a few times bigger than Mars, ended up 155 times as far away from its parent star as Earth is to the sun. "We're learning a lot about planets that are close to their stars, but that is not the full picture. We also want to know about systems where planets are very far out. By considering near-, far- and mid-range, we can get a complete picture of planet formation,” University of Florida astronomer Aaron Boley told Discovery News."