See a lunar scar darken the crescent moon on May 30 Lunar maria or 'seas' formed when lava flooded impact basins billions of years ago. Astrobitica May 29, 2025 (Last updated: May 29, 2025) 1 minute read Lunar maria or ‘seas’ formed when lava flooded impact basins billions of years ago. About the Author Astrobitica Administrator Visit Website View All Posts Post navigation Previous: Who is the best Doctor? Every ‘Doctor Who’ rankedNext: How to Handle Resource Waste from ISRU on the Moon