Drag the slider to see where the Sun has been and where it's heading. Today is marked at center.
← pastfuture →
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Radius
—R☉
Luminosity
—L☉
Surface
—K
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Earth—
Stage timings and properties follow Schröder & Smith (2008) and Sackmann, Boothroyd & Kraemer (1993). Present-day Sun age from meteoritic CAI dating; current solar parameters from the NASA Sun Fact Sheet. Far-future timing (red-giant tip onward) carries model uncertainty of a few hundred million years.
Sources