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In this episode, we step inside the thermonuclear furnace of our closest star to explore the delicate physics keeping it alive and the hidden countdown to its ultimate demise.

Powered by a relentless gravitational weight that crushes its core into a plasma furnace of tens of millions of degrees, the sun survives on a strict balance between inward gravity and the outward push of nuclear fusion.

But calculating the sun's precise lifespan has been plunged into a fascinating scientific mystery.

It turns out that a tiny detail, the exact "recipe" of the sun's heavy chemical ingredients, or its metallicity, acts like a thick winter coat, trapping core radiation and dictating how fast the star burns through its finite hydrogen fuel.

For decades, this recipe was considered a settled cornerstone of astronomy.

Now, two of science's most trusted methods of "reading" the sun are locked in a major contradiction, threatening to alter our standard solar model and force a massive 10 to 15 percent recalculation of the age of the entire cosmos.