The sun's energy and life span
The Sun releases enormous amounts of energy through nuclear fusion happening deep in its core, and that energy gradually works its way outward and eventually reaches Earth as radiation, powering nearly everything that happens on our planet's surface. Comparing the Sun to other stars of similar mass gives scientists a way to estimate how long a star like the Sun can keep shining this way, and directly observing how the Sun's own radiation output varies, through its 11-year sunspot cycle and occasional solar flares, confirms that the radiation reaching Earth really is coming from the Sun's own ongoing activity.
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