Historical clue formulations

• Opportunity on Mars, say — 2026-08-07
• Martian explorer — 2025-11-18
• Opportunity on Mars, e.g. — 2023-11-30
• One of six parked on the moon — 2020-10-18
• Land ___ (British luxury vehicle) — 2020-04-27
• Explorer on Mars — 2020-03-24
• Standard dog name — 2017-08-08
• Mars vehicle — 2017-07-30
• Mars explorer — 2014-09-30
• Vehicle on Mars — 2014-04-06
• Spot alternative — 2012-09-12
• Exploration vehicle — 2010-06-19
• Unsettled sort — 2007-11-24
• Gadabout — 2007-04-16
• Vagabond — 2007-04-01
• Mars Pathfinder, for one — 2002-12-12
• Vagabond — 2001-08-27
• - — 2000-06-07
• Itinerant — 1996-12-26
• Friend for Fido — 1996-10-14
• Pirate — 1996-03-30
• British-made car — 1995-09-15