Planets facts
One short astronomy fact per day, each with a figure and a source. Pick a topic or scroll back through the days.
May 2025
- May 17 PlanetsEarth and Venus Are Closer Than Any Other Planets
- May 16 PlanetsNeptune Is So Far That Sunlight Takes Over 4 Hours to Reach It
- May 14 PlanetsEarth Would Fit Inside Jupiter’s Great Red Spot
- May 9 PlanetsSuper-Earths Might Be the Best Places for Life
- May 5 PlanetsTriton Orbits Neptune the “Wrong” Way
- May 4 PlanetsTitan Has Lakes of Liquid Methane
- May 3 PlanetsJupiter Has the Most Powerful Auroras in the Solar System
- May 2 PlanetsJupiter’s Moon Ganymede Has Its Own Magnetic Field
April 2025
- Apr 26 PlanetsMars Has Blue Sunsets
- Apr 13 PlanetsNeptune’s Atmosphere Cooled Then Warmed for Unknown Reasons
- Apr 12 PlanetsUranus Rolls Around the Sun on Its Side
- Apr 11 PlanetsNeptune’s Winds Are the Fastest in the Solar System
- Apr 7 PlanetsA Day on Mercury Has Two Sunrises
- Apr 4 PlanetsThe First Exoplanet Was Discovered Around a Dead Star
- Apr 2 PlanetsThe Great Red Spot Is Shrinking
March 2025
- Mar 25 PlanetsThe Other Planets Nearly Fit Between Earth and the Moon
- Mar 21 PlanetsYou Weigh Less at the Equator Than at the Poles
- Mar 20 PlanetsJupiter Has the Deepest Ocean in the Solar System (But It’s Not Water)
- Mar 16 PlanetsVenus Has Metal Snow
- Mar 15 PlanetsSome Planets May Be Made of Crystallized Carbon and Oxygen
- Mar 14 PlanetsVenus Has the Hottest Surface in the Solar System
- Mar 12 PlanetsThere’s a Giant Hexagon on Saturn’s North Pole
- Mar 9 PlanetsA Planet Once Thought to Be Made of Diamond
- Mar 6 PlanetsSome Planets Are Roaming the Galaxy Alone
- Mar 5 PlanetsA Day on Mercury is Longer Than Its Year
- Mar 3 PlanetsJupiter’s Moon Io is the Most Volcanic World in the Solar System
- Mar 3 PlanetsSaturn’s Moon Titan Has Rivers and Lakes—But They’re Not Water