Glossary term: Disk

Description: A disk is a flattened system of matter that is in circular coplanar motion about a common center. The material in a disk can be many different things such as gas, dust, or even stars. Examples include accretion disks around protostars, protoplanetary disks around young stellar objects, accretion disks around active galactic nuclei, and galactic disks.

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Term and definition status: This term and its definition have been approved by a research astronomer and a teacher

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".