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“In astronomy, there’s a simple formula for stars: add more mass, and your star becomes brighter, bluer, and hotter. This pattern hold from stars just a few percent the mass of the Sun to over 200 times as massive. But there’s a limit to the temperature these stars achieve, even the most massive ones. If you want to go hotter, you need something extra: to lose your hydrogen.”

The most massive stars in the Universe are true behemoths, rising to hundreds of times the mass of our Sun and burning at temperatures upwards of 30,000 K at their surface. But there are stars out there that are even hotter, despite only being 10% or less as massive: Wolf-Rayet stars. The key to their cosmic success? Blowing off their outer layers of hydrogen. By only leaving the dense, massive core of already-fused elements, Wolf-Rayet stars burn helium, carbon, oxygen or even heavier elements at their centers, while the journey to the surface “only” cools the star down to ~200,000 K by time the edge of the photosphere is reached. Elements like carbon, nitrogen, and oxygen may be ionized up to four times when their spectra are viewed.

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