| It spins so quickly that it is surrounded by a circumstellar disc of matter, flung off via centrifugal force. |
| An outflow develops and the star is progressively surrounded by an expanding circumstellar shell of dust and gas. |
| A protoplanetary disk is a circumstellar disk of dense gas that surrounds a newly formed star. |
| Superluminal light echoes were seen as light from the outburst propagated into the surrounding, pre-existing circumstellar dust. |
| Oceans may also exist on exoplanets and exomoons, including surface oceans of liquid water within a circumstellar habitable zone. |
| In addition to planet detection, GPI will also be capable of polarimetric imaging of circumstellar dust disks, studies of evolved stars, and high-Strehl imaging spectroscopy of bright targets. |
