Planets facts
One short astronomy fact per day, each with a figure and a source. Pick a topic or scroll back through the days.
March 2025
- Mar 3 PlanetsSaturn’s Moon Titan Has Rivers and Lakes—But They’re Not Water
- Mar 3 PlanetsJupiter’s Moon Io is the Most Volcanic World in the Solar System
February 2025
- Feb 23 PlanetsThe Largest Volcano in the Solar System is on Mars
- Feb 22 PlanetsThere’s a Planet Where It Rains Glass Sideways
- Feb 21 PlanetsVenus Spins the Wrong Way
- Feb 17 PlanetsThere’s a Planet That’s Literally Evaporating
- Feb 15 PlanetsSome Planets Rain Rocks
- Feb 12 PlanetsSaturn’s Rings Are Temporary
- Feb 10 PlanetsRogue Planets Can Have Underground Oceans
- Feb 9 PlanetsJupiter’s Lightning is Not Like Ours