The phrase "dusty disk" refers to a flat structure made up of small pieces of dust or debris. It is often used to describe a formation in outer space that surrounds a star or planet. Full definition
This mirrors the pattern that astronomers see in young, full - fledged stars, he says, where astronomers see evidence that embryonic planets clear out gaps in dusty disks. (sciencemag.org)
Stars wrapped in warm, dusty disks sound cozy, and in cosmic terms, they are. (discovermagazine.com)