en niven ring (n)
― IsA ⟶
Weight: 1.0
en megastructure Source: English Wiktionary
en dyson sphere (n)
― IsA ⟶
Weight: 1.0
en megastructure Source: English Wiktionary
en alderson disk (n)
― IsA ⟶
Weight: 1.0
en megastructure Source: English Wiktionary