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With unusually powerful magnetic fields, these stars seem to get a boost when their cores start to drift apart. Thus, they may not be the ideal hosts for habitable exoplanets.
The burnt-out star has one side composed of hydrogen and the other composed of helium. Astronomers have never seen anything like it.
Neutron stars are created when massive stars reach the ends of their lives and are composed of the densest matter in the known universe.
13.5-billion-year-old clouds are poor in iron, suggesting they precede the dissemination of heavier elements.
The white dwarf is the dead core of a star that burned out a billion years ago.