Alderson disk

== English == === Alternative forms === Alderson disc === Etymology === Named after American programmer Dan Alderson, who invented the concept. === Noun === Alderson disk (plural Alderson disks) A hypothetical megastructure in the form of a disk with a star located in a hole running through its axis, and massive enough to have its own atmosphere ==== Hypernyms ==== megastructure ==== Coordinate terms ==== Dyson sphere Niven ring