Sun 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
April 2025
- Apr 28 SunThe Sun Has an 11-Year Mood Cycle
- Apr 9 SunThe Sun’s Core May Spin Faster Than Its Outer Layers
March 2025
- Mar 27 SunThe Sun Will One Day Swallow Earth (But Not for a While)
- Mar 1 SunThe Sun’s Atmosphere is Hotter Than Its Surface