Study of a protoplanetary disk about 400 light-years from earth yields clues to the development of exoplanets. For the first time, scientists were able to use a technique called light echo to analyze the distance between the disk and the young star at its center.
Read more at: http://www.inquisitr.com/3050016/protoplanetary-disk-study-looks-at-light-for-clues-to-exoplanet-mysteries/
Anya Wassenberg 