Historical clue formulations

• "Star Wars" planet where Luke Skywalker rides a tauntaun — 2026-07-09
• Ice planet in "The Empire Strikes Back" — 2024-10-12
• Ice planet in "The Empire Strikes Back" — 2024-08-27
• Ice planet in "The Empire Strikes Back" — 2018-10-20
• Ice planet in "The Empire Strikes Back" — 2015-08-28
• Ice planet in "The Empire Strikes Back" — 2015-08-04