Close-up view of the EF Eridanus system as it might appear today

Mystery Object Neither Star Nor Brown Dwarf |  Astronomers including Steve Howell of NOAO-WIYN have used the Gemini North and Keck II telescopes to peer inside a violent binary star system to find that one of the interacting stars has lost so much mass to its partner that it has regressed to a strange, inert body resembling no known star type. Gemini Press Release

Illustration credit: Jon Lomberg/Gemini Observatory