What created this unusual hole in Mars? Actually, there are numerous holes pictured in this Swiss cheese-like landscape, with all-but-one of them showing a dusty, dark, Martian terrain beneath evaporating, light, carbon dioxide ice. The most unusual hole is on the upper right,… pic.twitter.com/RkJr04GnZv

— Astronomy Picture Of the Day (@apod) April 15, 2025