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Glossary term: Galactic Disk

Description: The galactic disk is the disk component of the Milky Way that contains stars, gas, and dust in circular coplanar motion around the galactic center. The galactic disk is thought to feature four spiral arms, where star formation is ongoing. The observable disk has a diameter of about 100,000 light years and a thickness of about 3000 light years.

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Term and definition status: This term and its definition is still awaiting approval

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".