Artist impression of a planet-forming disk around a sun-like star. The studied disks were known to have gaps in the dusty disks (represented by the brownish color in the image) but the astronomers found that gas is still present inside these gaps (represented by the white color in the image). This can either mean that the dust has clumped together to form planetary embryos, or that a planet has already formed and is in the process of clearing the gas in the disk. Credi: ESO/VLT
