Astronomers discover a hidden white dwarf causes Gamma Cassiopeiae’s intense X-rays, solving a 50-year mystery and confirming a new class of binary star systems. Stars shine not only in light but in X‑rays. For the biggest ones, over ten times the Sun’s mass, this comes from turbulent winds blasted out by their intense radiation. These unstable winds crash into one another, creating shocks that heat the gas a... [3314 chars]
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