The Dead Stars That Refuse to Fade in a Galaxy Next Door

Astronomers found 22 exploded-star remnants in nearby galaxy M83 acting strangely in X-rays.

About half changed brightness over 14 years, when textbooks say they should only fade.

One culprit may be a surviving 'sibling' star feeding a black hole or neutron star.

Another is cosmic recycling: blast debris falling back onto the object the blast created.

M83 lies 15 million light-years away, yet Chandra tracked these flickers in detail.

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