A supernova remnant called Telios was recently discovered to be almost perfectly round. (Image credit: Filipovic et al. 2025, arXiv)
Astronomers have stumbled upon an ominous, almost perfectly spherical supernova remnant glowing faintly at the edge of the Milky Way. But they aren't sure of the ghostly orb's size or distance — or how it got its unusually symmetrical shape.
Scientists have designated the object G305.4–2.2, or Telios, which means “perfect” in Greek. Telios was captured in radio images taken by the Australian Square Kilometre Array Pathfinder (ASKAP) telescope in Western Australia as part of the Evolutionary Map of the Universe project. It is a supernova remnant (SNR) — an expanding cloud of gas and radiation left behind by the explosion of a star.
Most supernova remnants are at least roughly spherical due to the multi-dimensionality of the explosions, although some may take on more unusual shapes as they disperse or are affected by other explosions or stellar winds. However, it is extremely rare to find a remnant that appears to be virtually free of imperfections.
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