Mysterious Blue Ring Nebula And The Fate Of Binary Stars

The mysterious Blue Ring Nebula, composed of expanding hydrogen gas (blue) expanding from a central star, which is the remnant core of a stellar merger. Red filaments are shockwave filaments from the merging event. Credit: NASA/JPL-Caltech/M. Seibert (Carnegie Institution for Science)/K. Hoadley (Caltech)/GALEX Team

Astronomers have discovered a rare object called the Blue Ring Nebula, a ring of hydrogen gas with a star at its center.

The properties of this system suggest it is the remnant of two stars meeting their ultimate demise: an inward orbital dance that resulted in the two stars merging.

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