NASA's Spitzer Space Telescope has... observed infrared light coming from one such disk around a young star, called LRLL 31, over a period of five months. To the astronomers' surprise, the light varied in unexpected ways, and in as little time as one week... One possible explanation is that a close companion to the star -- either a star or a developing planet -- could be shoving planet-forming material together, causing its thickness to vary as it spins around the star... said James Muzerolle of the Space Telescope Science Institute, Baltimore, Maryland[,] "This is a unique, real-time glimpse into the...